A loaded gun was found Thursday at Penn Hills Senior High School despite metal detectors at the school.

District spokeswoman Teresita Kolenchak said that several students were standing in the hall when a teacher approached. The students fled, leaving a gun on the floor. The teacher confiscated the gun and turned it over to administration, which turned it over to police. The students were located. She said no threats were involved.

The student suspected of bringing the gun has been removed from school and the matter was referred to police.

Ms. Kolenchak said it is believed the suspect arrived late for school. Standard procedure calls for students who are late to go through a metal detector and have any backpacks checked by hand. For those who arrive on time, only some students go through the security procedure.

She said Superintendent Joseph Carroll said this was a "security breach" that has been corrected.

Video of the student's entrance to the school is being reviewed.