WASHINGTON (AP) — An Air Force officer, his wife and four children were injured in the attack at the Brussels airport, U.S. officials said Tuesday, as more details began to surface about Americans hurt in the bomb blasts that killed at least 31 and wounded nearly 190. 
 
 The command also said that any official travel to the NATO hub would require approval. The restrictions don't apply to military personnel assigned to posts in the city. 
 
 European Command officials would not release details of the injuries to the Air Force officer or his family, due to privacy concerns. But U.S. officials confirmed the officer was a lieutenant colonel, and that he and his family were injured at the attacks in the airport. The officials spoke on condition of anonymity because they weren't authorized to discuss the details publicly. 
 
 Gen. Philip Breedlove, commander U.S. European Command, said the U.S. will assist authorities in Belgium in any way they can, adding that we "will continue to stand by our NATO allies and partners to defeat these terrorists who threaten our freedoms and our way of life." 
 
 European Command said that it is continuing to confirm the safety of U.S. military personnel and families in the region, including those who may be there on vacation or official travel. 
 
 The injuries bring the total to at least nine Americans who were hurt in the explosions that ripped through the Brussels Airport and a metro station Tuesday. Mormon church officials said three missionaries from Utah were seriously injured in the airport attack and have been hospitalized. 
 
 The Islamic State militant group has claimed responsibility for the attack. 

 Three Mormon missionaries from Utah and a U.S. Air Force member and his family were among an unknown number of Americans hurt on Tuesday in the deadly bomb attacks in Brussels, government and church officials said. 
 
 No Americans are known to be among the at least 30 people killed in the blasts at the airport and on a subway train in the Belgian capital, the U.S. State Department said. 
 
 The blasts occurred Tuesday morning in Brussels, which is also the headquarters of the European Union. The attack on the subway train occurred at a station close to EU institutions. 
 
 "We know that a number of U.S. citizens were injured in the attack, but we do not have an accurate figure right now," State Department spokesman John Kirby told a briefing. 
 
 The American missionaries and service member were all injured in the attack in the departure hall of Zaventem airport, according to the military and church officials. 
 
 The U.S. Air Force said the airman was from Joint Force Command Brunssum in the Netherlands. He was not identified by name, and officials provided no details on his condition or that of his injured family members. 
 
 "We are saddened by today's attacks and extend our sincere condolences to the victims and families of those impacted," Secretary of the Air Force Deborah Lee James said in a statement. 
 
 The three missionaries were seriously injured and have been hospitalized, the Church of Jesus Christ of Latter-day Saints said in a statement. 
 
 The church identified them as Richard Norby, 66, Joseph Empey, 20, and Mason Wells, 19. They are based at the church's mission in Paris. 
 
 Empey's parents said he had been treated for burns to his hands, face and head, and had undergone surgery for shrapnel injuries to his legs. 
 
 "We have been in touch with him and he is grateful and in good spirits," Court and Amber Empey said in a statement. 
 
 A fourth missionary, Sister Fanny Rachel Clain, 20, of Montélimar, France, who was with the American missionaries, also was hospitalized with minor injuries. Although Clain was with the three other missionaries who were injured, she had left them and passed through airport security when the explosion occurred, the church said. 
 
 Three students from Quinnipiac University in Connecticut were in the Brussels airport at the time of the attack but are safe, the school said on Facebook. 
 
 (Additional reporting by David Alexander, Idrees Ali and Phil Stewart; Editing by Chizu Nomiyama, James Dalgleish and Leslie Adler) 

 CLOSE Three Mormon missionaries from Utah were injured during the explosions at Brussels' international airport. Video provided by Newsy Newslook 
 
 Mormon missionary Richard Norby, 66, of Lehi, Utah, pictured with his wife, was injured in the Brussels airport attacks on Tuesday. (Photo: The Church of Jesus Christ of Latter-day Saints) 
 
 Three Mormon missionaries from Utah were among those injured during terror attacks Tuesday in the main airport in Brussels, according to church officials and family members. 
 
 The bombings, two at the airport and one in the city's subway, killed at least 30 people and injured scores. 
 
 The Church of Jesus Christ of Latter-day Saints said the three — Richard Norby, 66, of Lehi, Joseph Empey, 20, of Santa Clara, and Mason Wells, 19, of Sandy — were serving in the church’s Paris mission. They were all “seriously injured” while dropping off another missionary at airport security, the church said in a statement. 
 
 “The missionaries were taking Sister Fanny Rachel Clain, 20, of Montélimar, France, to the airport,” the church's statement added. “Sister Clain had been serving in that mission while awaiting a permanent visa for the United States.” 
 
 In a later statement, the church said that Clain was hospitalized with minor injuries. "She was with the three other missionaries who were injured," the statement said, "but had left them and passed through airport security when the explosion occurred." 
 
 Mormon missionary Joseph Empey, 20, of Santa Clara, Utah, was injured in the Brussels attacks Tuesday. (Photo: The Church of Jesus Christ of Latter-day Saints) 
 
 In a Facebook post, Empey's parents, Court and Amber Empey, said that they were "grateful that Elder Empey and his companion Elder Wells are okay." 
 
 The couple said their son will need surgery on a leg wound "and does have some shrapnel in his ankles and knee. He has some 2nd degree burns to his hands and head. He has been in contact with us. We would all like to thank you for your love and prayers.” 
 
 In a later statement issued through the church's public affairs office, the Empeys said that surgery "was just completed for shrapnel injuries to his legs. We have been in touch with him and he is grateful and in good spirits. ... We are thankful for the outpouring of love and prayers from throughout the world, and we pray for all those affected by this tragedy." 
 
 Santa Clara 14th ward bishop Chad Parker said he had visited the Empey family on Tuesday morning. "They're just grateful that he and the other missionaries are doing OK," he said, 
 
 Empey was scheduled to return home from his mission in July. 
 
 Kaleen Lambson-Talley, the secretary to the principal at Snow Canyon High School, where Empey graduated in the class of 2014, said her son played on the rugby team with Empey. 
 
 Mason Wells, 19, of Sandy, Utah. was injured in the Brussels airport attacks on Tuesday. (Photo: The Church of Jesus Christ of Latter-day Saints) 
 
 “He’s a great individual. … Smart, a good student,” Lambson-Talley said. “It’s a real hard day for us.” 
 
 Empey’s friend Navy Dalton said he visited the young man’s family Tuesday morning and saw the missionary and his parents text each other. 
 
 "He loves having fun, he loves making people smile and he loves joking," Dalton said, adding that Empey is “an amazing musician” who enjoys playing the guitar, banjo and ukulele. 
 
 He said the pair wants to set up a non-profit for inner-city youths after Empey returns home. “We want to focus on kids in the inner city that get looked over,” Dalton said, noting that during his own mission in Denver he saw children who never seemed to have more than one pair of clothes, and who played in the streets without shoes. 
 
 “We want to educate them, help them,” Dalton said. 
 
 Empey is serving in the France-Paris mission, a portion of which covers parts of Belgium. He was serving in France when terrorists launched an attack on Paris neighborhoods in November, killing more than 100 people. 
 
 Two prominent Utah politicians, longtime U.S. Senator Orrin Hatch and Governor Gary Herbert reacted to the events in Belgium, including the injuries to the missionaries. 
 
 Mormon missionary Fanny Rachel Clain, 20, had passed through security. She received minor injuries. (Photo: The Church of Jesus Christ of Latter-day Saints) 
 
 "Once again, the forces of evil have attacked an ally of freedom," Hatch said in a tweet. "We pray for the families of the fallen and for the LDS missionaries from Utah who have been injured in these attacks. The world must stand united against terrorism to hold those accountable for these senseless acts of violence." 
 
 Gov. Gary Herbert also posted on Twitter: "“It is not uncommon for innocent victims to be targeted in these terrorist attacks," he said, "but seldom do we see people of faith who have forsaken everything – family, friends, school and careers – in order to share a message or hope and love with the world also fall victim," Herbert said, referring to the missionaries. 
 
 "To the Norby, Empey and Wells families, please know that the state of Utah is united in prayer at this time for the health and well-being of your missionaries. As Utahns, we stand together with our fellow Americans and those around the world in our resolve to put an end to these acts of terror.” 
 
 Contributing: Jud Burkett, Kevin Jenkins and Casie Forbes, The (St. George, Utah) Spectrum. 
 
 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION Brussels bombers originally planned more attacks in Paris | 0:56 Prosecutors say the Brussels attackers were originally targeting Paris in a second wave of attacks.Video provided by Newsy Newslook 1 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION 'Man in hat' among several Brussels bombing suspects arrested | 0:45 Authorities have arrested several suspects in the Brussels bombings, including one of the wanted men seen in airport surveillance footage.Video provided by Newsy Newslook 2 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION Raw: Muslims Honor Brussels Attacks Victims | 0:55 Representatives of Belgium's Muslim communities gathered outside Maelbeek Metro station on Saturday to pay their respects to those killed in an attack at the station last month. 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(March 25) AP 10 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION Brussels attack: What we know so far | 1:06 Americans were among those killed in the Brussels terror attacks, confirmed by U.S. Secretary of State John Kerry, who traveled to Belgium to hold counter-terrorism talks with European officials. VPC 11 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION Brussels Attack Survivor: ‘I Feel Lucky’ | 2:39 Mason Wells, a 19-year-old from Utah, is expected to make a full recovery after surviving the bombing attack at the Brussels airport on Tuesday. (March 25) AP 12 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION 5 things to know about the Brussels terror attacks | 1:00 Tragedy struck Brussels when bombers targeted Brussels Airport and a city metro station. ISIL is claiming responsibility for the violence. VPC 13 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION 3 things we still don't know about the Brussels attack | 0:44 While investigators try to piece together the Brussels attack, many questions about the terrorists involved and missing victims still remain unanswered. VPC 14 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION Kerry confirms that Americans died in Brussels attack | 0:46 U.S. Secretary of State John Kerry confirmed that Americans were among the dead after the terrorist attacks in Belgium. USA TODAY 15 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION Raw: Hundreds Honor Brussels Attack Victims | 1:13 Hundreds of people gathered at Place de La Bourse in central Brussels on Thursday to observe a minute of silence for the victims of attacks that hit the city two days ago. 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(March 23) AP 18 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION ISIL claims responsibility for deadly explosions in Brussels | 1:40 The multiple explosions have killed at least 34 people at an airport and a subway station in Brussels.Video provided by Newsy Newslook 19 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION Manhunt Underway For Brussels Bombing Suspect | 1:41 Belgian authorities searched Wednesday for a man pictured with two apparent suicide bombers, a day after 34 people were killed, including three suicide bombers, and more than 200 wounded in attacks at the Brussels airport and subway. (March 23) AP 20 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION 3 Mormon missionaries from Utah hurt in Brussels attacks | 1:03 Three Mormon missionaries from Utah were injured during the explosions at Brussels' international airport. Video provided by Newsy Newslook 21 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION U.S. cities step up security after Belgium attacks | 1:54 US Cities ramped up security at airports, transit systems and landmarks across the country Tuesday following the deadly terror attacks in Brussels. Still, officials assured Americans they knew of no specific or credible threats. (March 22) AP 22 of 28 Skip in Skip x Embed x Share CLOSE TERROR ATTACKS ROCK BRUSSELS AIRPORT, METRO STATION Obama: We 'stand in solidarity' with people of Belgium | 0:48 President Barack Obama commented on the Brussels terror attacks before addressing the people of Cuba in Havana. He said the world needs to unite to fight violence and terrorism. 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– Among those hurt in the terrorist attacks in Brussels on Tuesday: three Mormon missionaries from Utah and an Air Force officer and his family. Richard Norby, 66, Joseph Empey, 20, and Mason Wells, 19, were injured in the explosion at Brussels airport, the Church of Jesus Christ of Latter-day Saints confirmed, as Reuters reports. The Paris-based missionaries have been hospitalized and USA Today reports they were "seriously" hurt, but details are scarce. US officials tell the AP an Air Force lieutenant colonel, his wife, and their four children were also injured in the airport attack, though no further details were available on their conditions. At least 31 people were killed in the attacks at the airport and on a metro train.