Montgomery County Police headquarters explosion poses no threat, police say

Police at the Montgomery County Police heaquarters. (WJLA)

Montgomery County Police say there was a small explosion outside the police headquarters in Gaithersburg Tuesday but added the explosion posed no threat.

Police say the explosion occurred at about 11 a.m. in the parking lot of the headquarters at 100 Edison Park Drive.

Bomb technicians with the Montgomery County Fire and Rescue Department located a low grade explosive, possibly a firework or fire cracker.

Police are questioning a juvenile.