Passage: During the 1981 Trooping the Colour ceremony, six weeks before the wedding of Prince Charles and Lady Diana Spencer, six shots were fired at the Queen from close range as she rode down The Mall on her horse, Burmese. Police later discovered the shots were blanks. The 17-year-old assailant, Marcus Sarjeant, was sentenced to five years in prison and released after three. The Queen's composure and skill in controlling her mount were widely praised.Months later, in October, the Queen was the subject of another attack while on a visit to Dunedin, New Zealand. New Zealand Security Intelligence Service documents declassified in 2018 revealed that 17-year-old Christopher John Lewis fired a shot with a .22 rifle from the fifth floor of a building overlooking the parade, but missed. Lewis was arrested, but never charged with attempted murder or treason, and sentenced to three years in jail for unlawful possession and discharge of a firearm. Two years into his sentence, he attempted to escape a psychiatric hospital in order to assassinate Charles, who was visiting the country with Diana and their son Prince William.From April to September 1982, the Queen was anxious but proud of her son, Prince Andrew, who was serving with British forces during the Falklands War. On 9 July, the Queen awoke in her bedroom at Buckingham Palace to find an intruder, Michael Fagan, in the room with her. In a serious lapse of security, assistance only arrived after two calls to the Palace police switchboard. After hosting US President Ronald Reagan at Windsor Castle in 1982 and visiting his California ranch in 1983, the Queen was angered when his administration ordered the invasion of Grenada, one of her Caribbean realms, without informing her.

Question: What kind of bullets were fired at Queen?
blanks