inert

"They tell me that they are digging so many boreholes - 140 boreholes or something - and all they have found there is inert waste, builders rubble and stuff."

"Various Second World War-era unexploded ordnance items were discovered as a result of the wildfires, which the EOD operator declared to be inert practice projectiles. They were retrieved for subsequent disposal," he explained.

Its warhead is reported to have deliberately fragmented during its final descent into several, independently targeted inert projectiles, a methodology dating back to the Cold War.

Bomb squad technicians had X-rayed the explosives and told city police they believed the devices were inert, according to a search warrant obtained by The Times this week.

It’s unclear whether officials still believed the grenades were inert when they were handled on Friday.