Dozens of World War II-era training bombs were accidentally discovered at a playground in Wooler, Northumberland, in northern England.

During maintenance work, two bombs were initially found and removed by British Army bomb disposal experts. The local council then requested a full inspection of the playground.

On the first day of the search, 65 training bombs weighing 10 pounds (about 4.5 kg) and smoke grenades were uncovered. The following day, another 90 training bombs were found.

In total, the investigation revealed 174 objects, according to CNN.

Training bombs contain small amounts of explosives and require specialized handling for safe removal.

The area had been a military training ground during the war. It appears that unexploded bombs were buried there after the war ended.