( CNN ) -- A young male pulled a handgun Friday afternoon inside a Philadelphia high school gymnasium , firing and hitting two fellow students , police said . The injured boy and girl , each 15 , were transported in stable condition after being shot in the arm just before 3:30 p.m. , Philadelphia police Lt. John Stanford said . The students were among about seven in the Delaware Valley Charter High School gym at that time -- some playing basketball , others in one corner -- according to city police Commissioner Charles Ramsey . `` The suspect is part of that group , '' Ramsey said . Both victims appeared to have been struck once inside the gym of Delaware Valley Charter High School , said Stanford . Ramsey said that authorities did n't know yet if they were struck by the same bullet or more than one , noting that no shell was found at the scene . He described their wounds as non-life threatening . The school went into lockdown as law enforcement officers cleared it and hunted for the suspect , who had left the building , according to Stanford . The police lieutenant said students were searched and then let out of the school . He also said surveillance video had captured the incident . A short time later , Philadelphia police tweeted they had a suspect in custody . Officer Jillian Russell , a police spokeswoman , said he was 17 years old . Ramsey later said authorities were able to `` identify him right away , '' after which officers were sent to his home . `` We were able to grab him , '' the police commissioner said . `` We did not recover the gun , but we do have him in custody and he has been positively identified . '' But a few hours later , Stanford said that young man was not the shooter as police initially thought , though he was at the scene . He was `` completely cleared by investigators and released '' later that night , the police lieutenant said . By then , Philadelphia police had announced they were `` still looking for additional suspects . '' This includes searching for a weapon possibly used in the shooting in trash cans , along the tracks and other spots around the Southeastern Pennsylvania Transportation Authority 's Olney station , SEPTA spokesman Andrew Busch said . While a gun had n't been found by 9 p.m. , Stanford said one of the two young males authorities had been looking for had turned himself in . A third male wanted by police had been expected to do the same but had not turned himself in as of 10:45 p.m. , added the police spokesman . All three youths are Delaware Valley Charter High School students . It is not clear if any of them are , in fact , the shooter . No one had been charged as of Friday night . Asked about what might have prompted the shooting , Ramsey said , `` We do n't know the motives -- do n't know if it was an accident , do n't know if it was intentional . '' Located in the Olney section of Philadelphia , Delaware Valley Charter High School is open to any student who lives in the city . In its 2011 annual report to the state Department of Education , the school noted that it moved into its new facility in June 2006 and reported significant growth in reading and math test scores in recent years . Friday 's incident was at least the second shooting at or near a school this week . In New Mexico on Tuesday , a 12-year-old student with a sawed off , 20-gauge pump shotgun opened fire in a crowded gymnasium at Berrendo Middle School , according to authorities . Two students were seriously injured and the shooter was in custody . Ramsey , the Philadelphia police commissioner , acknowledged that such shootings are `` happening across our country all too often , and it 's just got to stop . '' `` ( When ) people send their kids to school , they should n't have to pick them up at the hospital , '' Ramsey added . `` I mean , these kind of things just absolutely should not happen . '' CNN 's Jason Carroll , Poppy Harlow , Cristy Lenz , Haley Draznin , Kevin Conlon and Ray Sanchez contributed to this report .
NEW : Police : Student initially identified as the shooter is `` cleared and released '' NEW : One wanted student had n't turned himself in by late Friday as expected . Suspect opened fire in a Philadelphia high school gym around 3:30 p.m. One male , one female student were shot in the arm , according to police .