A student at Upper Darby High School who was found with a loaded gun, a knife and ammunition on school grounds today had sold a gun to another student at the school earlier this morning, said Upper Darby Police Superintendent Michael Chitwood.
Police said they found the illegally-purchased gun on the second student and arrested both teens.
Around 1 p.m., a student at the school saw another student carrying a gun and reported it to a teacher, who in turn reported it to school security, police said.
That student was stopped and found to be in possession of a loaded .25, a knife and ammunition for a .380, Chitwood said. The student told police that the ammunition was for a gun he'd sold to another student at the school earlier in the day, according to police. That second student was tracked down and the gun was found in his possession, Chitwood said.