The police Bomb Squad was called this morning to remove a hand grenade from a South Philadelphia elementary school.

The grenade was a dummy, police said.

Students at the Taggart Elementary School at 4th and Porter Streets were temporarily evacuated to another school after the device was found on a desk in the building's first floor police office about 8 a.m.

They were allowed to return after the Bomb Squad squad removed the device about 8:45 a.m. and explosives sniffing bomb dogs swept the school as precaution.

Philadelphia Police investigators are trying to determine how the dummy grenade ended up in the school.

Police said the device was a hollowed out grenade and had been wrapped in paper.