Authorities in Colorado are warning summer hikers to be on the lookout for unexploited avalanche mitigation devices that were fired this winter. The Department for Transportation in Colorado fired over 1,500 explosive devices this past winter some of which failed to detonate.

Related: Avalanche Conditions In Colorado Are Extremely Dangerous

Colorado’s Department for Transportation is reporting that 22 bombs failed to explode and are now causing a potential threat. These unexploded
ordnance could go off at anytime.

“There’s a chance someone could come upon an unexploded ordnance,” said a spokeswoman from the Colorado Department of Transport. “Our team is tracking where those unexploded ordnances are, but you may come upon them before we do.”

So if you’re hiking in Colorado this summer be on the look out.

This is what they look like.

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