UPDATE (1:46 p.m.) -- According to police, two suspects are in custody. The lockout at Diven Elementary School has been lifted. 

ELMIRA, N.Y. (WENY) -- Diven Elementary School has confirmed to WENY News that they are under a lockout due to a heavy police presence nearby. This means that business as usual is going on inside the school, but no one is permitted in and out. 

Elmira Police and New York State Police have set up a perimeter on Division Street. EPD says they are looking for a man with a handgun. 

We have a reporter on scene. We'll bring you more information as it becomes available.