North Yorkshire, England — The already-risky work of fire crews battling a wildfire in England's North York Moors National Park has been made all the more dangerous by World War II-era bombs and tank shells hidden under the dense, dry vegetation. A local fire official said Wednesday that there had been nearly 20 explosions as the fire burns through brush to detonate the hidden weapons.

"As the peat continues to burn down, it is finding the World War II ordnance and therefore exploding, and we have now experienced over 18 ordnance explosions within key areas," County Chief Fire Officer Jonathan Dyson said, according to CBS News' partner network BBC News .

The Langdale Moor fire, which started on August 11, has charred about 10 square miles in the picturesque coastal region of North Yo

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