A bomb squad was called out to the Stockton area of San Diego after police discovered a grenade there.
San Diego Police officers say they were following up on another investigation when they found the device in the 3200 block of Island Avenue at about 6:15 p.m.
No evacuations or road closures were put into place.
The bomb squad determined the device is an actual grenade, though it is inert, so it would not explode.
Police cleared the scene a short time later.