The Santa Clara County Sheriff's Office Bomb Squad on Friday buried and detonated a cache of World War II-era grenades that a Webster Street resident found in a box while cleaning the house, Palo Alto police said.
Officers learned about the discovered stash of explosives at about 3:35 p.m., when they received the call from a resident of the 1900 block of Webster, in Old Palo Alto. The person found a box that included eight grenades and a grenade discharger known as a "knee mortar." The person carried it outside and left it in the driveway, where it remained until police and the bomb squad arrived, police said.
The bomb squad tested the grenades and determined that at least one was still live, police said. They buried all the devices in the front yard of the house, covered them with 40 sandbags and detonated them at 7:17 p.m., police said. It remained unknown how many other grenades were live.
There were no injuries; just a few mild disruptions. Three homes were evacuated while police determined how to proceed. Residents in several adjacent homes were also asked to stay indoors. Webster Street was blocked off to traffic for about four hours, reopening at 7:50 p.m.
The Police Department also live-tweeted the event, just after the grenades were detonated, police announced the news on Twitter: "If you weren't within a few blocks, you likely didn't hear it."