PALO ALTO — The Santa Clara County Bomb Squad on Thursday evening safely detonated eight World War II-era grenades and mortars that were removed from a house on the 1900 block of Webster Street, according to Palo Alto police.

Lt. Zach Perron said the squad eventually buried all of the devices in the front yard of the residence, covered them with 40 sandbags and blew them up at 7:17 p.m. One device was live and it remains unknown how many of the remaining seven were still live at the time all were all destroyed. No one was injured.

Residents near the house earlier in the day were asked to stay inside their homes while the bomb squad determined how to safely dispose of the explosives, police said.

The “shelter in place” request was made after a resident cleaning out the recently sold house found a box, took it to the driveway and upon discovering grenades and mortars inside called the bomb squad at 3:35 p.m., according to the police.

Webster Street was closed from Seale Avenue to Santa Rita Avenue during the incident.

Some residents of the Old Palo Alto neighborhood heard helicopters overhead and wandered by out of curiosity.

“I was driving home from Mendocino and saw yellow tape,” said Sara Wood, terrier in tow.

Her daughter’s friend lives across the street from where the explosives were detonated and notified peers through Snapchat stories.

When asked whether she was surprised at the age of the explosives, Wood said she wasn’t.

“Like any neighborhood, we have residents who have been here for eons.”

Email Jacqueline Lee at jlee1@dailynewsgroup.com or call her at 650-391-1334; follow her at twitter.com/jleenews.