Workers removing a roof in Texas City nearly had the job done for them by accident.

The crew came upon a live World War II-era hand grenade in the attic.

An FBI bomb technician was called in to remove the grenade, after house owner Doug Johnson thought the item was a dummy, picked it up, then noticed the pin was still in place.

The grenade was detonated at a Texas City shooting range.

Nobody was injured in Thursday's incident.

Johnson told the Galveston County Daily News that he bought the house in 1992.

Johnson believes the grenade was in the attic since the more than half century-old house was built. He says the only access to that particular area was by removing the roof, which was damaged during Hurricane Ike.