It was a gun buyback — not a bomb buyback.

New York City police were holding a suspect Saturday who they say tried to turn in a live hand grenade to police at a gun-buyback program in the Bronx.

Authorities say the NYPD's bomb squad responded to a church where guns were being collected at around 4:30 p.m. and left 15 minutes later with the grenade, carrying it out in a special carrier. The program offers $200 for guns, no questions asked.

Police were questioning the man, who they didn't immediately identify. It's not clear if he will face any charges.