In this Sept. 27, 2016 photo, a poster featuring photos of Nisa Mickens and Kayla Cueva is part of a memorial near the spot where their bodies were found in Brentwood, N.Y. The girls, who were best friends,... (Associated Press) 
 
 In this Sept. 27, 2016 photo, a poster featuring photos of Nisa Mickens and Kayla Cueva is part of a memorial near the spot where their bodies were found in Brentwood, N.Y. The girls, who were best friends, were found murdered. Multiple teenagers from the same Long Island high school have been found... (Associated Press) 
 
 BRENTWOOD, N.Y. (AP) — The school year in one suburban New York community has started with funerals, fear and frustration. 
 
 Four teenagers from Brentwood High School on Long Island have been found dead within the past month, all suspected victims of gang violence. 
 
 On Sept. 13, the day before her 16th birthday, Nisa Mickens' brutally beaten body was found on a tree-lined street in Brentwood. A day later, the beaten body of her lifelong friend, 16-year-old Kayla Cuevas, was discovered in the wooded backyard of a nearby home. The teenagers had been inseparable and shared an interest in basketball. 
 
 Days later, police discovered the skeletal remains of 19-year-old Oscar Acosta and 15-year-old Miguel Garcia-Moran in a remote industrial area of the town. Acosta had been missing since May, and Garcia-Moran vanished in February. 
 
 Students are saying they're afraid to walk alone in their community and school administrators are warning students not to wear clothing that could risk offending vicious street thugs. 
 
 Alexis Portillo, 16, was devastated when he learned of the killings: "Like, who else is going to be next, you know?" 
 
 One Brentwood teen who wouldn't give his name, saying he feared gang retaliation, said many students are nervous. 
 
 "They don't play around. If they don't like you and if you do something to them, they will come after you," he said. "I'm not going to walk anywhere. We're definitely more cautious about that. I don't go out at night anymore." 
 
 A law enforcement official told The Associated Press that said the Salvadoran gang MS-13 is suspected, although police have not made arrests. The official was not authorized to talk publicly and spoke on the condition of anonymity. 
 
 Like many suburban areas, Long Island has become a home to street gangs. At least 30 people have been killed by MS-13 gang members on Long Island since 2010. 
 
 "There's definitely been an uptick, but we always have bad crews operating here," the official said. 
 
 In one particularly heinous killing, four MS-13 gangsters were convicted in the 2010 killing of a Long Island woman and her toddler son. Prosecutors say the mother had allegedly shown disrespect to the gang. Her child was murdered simply because he was with her. 
 
 In Brentwood, police are releasing few details about their investigation into students' deaths. 
 
 Abraham Chaparro, Garcia-Moran's stepfather, said he was last seen heading off to meet some friends. He said his stepson, who emigrated from Ecuador two years ago, liked cars, soccer and girls. 
 
 "He had a girlfriend in every corner. He was good-looking," Chaparro said. "I don't understand how this happened. It's a mystery." 
 
 A large photo of the boy smiling in a white suit and black bow tie sat at the front of a funeral home chapel as mourners paid respects this past week. 
 
 Maria Arias spent days going door to door looking for her son, Oscar, after he disappeared while reportedly going to a nearby park to play soccer. 
 
 Suffolk County Police Commissioner Timothy Sini says detectives are optimistic about arrests. A "violent known gang member" was in federal custody, he said, but the arrest papers and charges are under seal and no one is saying if that suspect is tied to any of the killings. 
 
 Last week, investigators searched a shuttered state psychiatric hospital for additional victims but came up empty. 
 
 All this leaves a community on edge. 
 
 Brentwood school officials said a freshman walking to a bus stop with a light blue T-shirt in his hand was stopped last week by a group in a car. The driver demanded the shirt, which was set on fire; the student was told not to wear that color again. Curtis Sliwa, founder of the New York City-based Guardian Angels, a neighborhood patrol group that has now started patrols in Brentwood, said blue is an MS-13 color. 
 
 School officials advised in a letter to parents that "children not wear clothing that could be considered to be gang-related." 
 
 Monique Darrisaw-Akil, assistant superintendent for secondary education, conceded that "students sometimes get involved in things that are not in their best interest or in the best interest of the school community, so we try to be as proactive, and provide interventions." 
 
 ___ 
 
 Associated Press videojournalist Ted Shaffrey contributed to this report. Follow Frank Eltman on Twitter at @feltman41. 

 “I got attitude like they were talking to somebody off the street,” Ms. Rodriguez said. “They wouldn’t even report it,” she added. “They told me to tell her: ‘Don’t go on the block.’” 
 
 The feeling of helplessness is spreading among the teenagers. 
 
 At a vigil held for the murdered girls before a football game, some students held signs: “Help Us!” “Stop the Violence!” Others shook their heads when Mr. Sini told students to call a hotline for investigative tips. 
 
 “We’re the ones out here, dealing with it all,” said a 16-year-old boy who would give only his nickname, Tiny T. “They think they can do something, but they’re just fooling. They can’t do nothing.” 
 
 At Kayla’s wake, a 17-year-old student too afraid of MS-13 to give his name said: “You don’t know who’s watching you, who’s following you. Just yesterday, a group of guys in a car with blue bandannas followed a girl home in Brentwood.” 
 
 He, his mother and his cousin wore T-shirts that read “Justice for Kayla,” which they had printed at the mall. “Afraid?” his cousin, a 19-year-old woman, said. “There’s not even a limit to afraid.” 
 
 At memorials for both Kayla and Nisa, on the cul-de-sac near where their bodies were found, basketballs sat among the glass candles and deflated balloons. Kayla, a tenacious athlete, was going to try out for the varsity basketball team this year. Instead, her mother was starting a scholarship fund called Ball Is My Life. 
 
 Ms. Rodriguez hoped her daughter’s death would at least stop the cycle. “It can’t go on anymore,” she said.
– September was an awful month for the town of Brentwood, New York. On Sept. 13, two teenage girls were found murdered, their bodies dumped near an elementary school. A week later, authorities discovered the skeletal remains of two male teenagers who had been missing for months. In both cases, authorities had a ready suspect: MS-13, a gang connected to Los Angeles and El Salvador, the New York Times reports. The group is prominent in Brentwood, where 68% of the population identifies as Latino or Hispanic and more than 17,000 residents are Salvadoran. While residents say the gang has caused trouble and fought with rivals in the past, the violence has recently turned toward schoolchildren. According to the AP, all four victims attended the same high school. School officials say gang violence rarely manifests inside the school itself, but administrators admit that they know of several students who may be affiliated. But they also say they cannot ban students suspected of being in gangs from attending school. "That’s state and federal law that they are entitled to an education," the principal of one of Brentwood's two public high schools says. Many parents in the community aren't satisfied with this explanation, especially as violence is becoming increasingly visible in their communities. One gang member has been arrested in connection to the recent murders, though a motive is not yet clear.