NORTH WOODSTOCK, N.H. — A brush fire near the popular Lost river Gorge and Boulder Caves in New Hampshire has spread to over 20 acres and closed part of a hiking path along the Appalachian Trail.

Firefighters say the fire started on a cliff in Kinsman Ridge over the gorge Tuesday morning and spread overnight. They aren’t sure of the cause; one theory is that it might have been caused by a meteor. Crews have been dropping water from helicopters, including a Blackhawk.

Fire officials estimate it could take several days to put out the fire, which is in rugged terrain.

Lost River Gorge was closed Tuesday as a precaution, but reopened Wednesday.

Forest officials closed part of the Kinsman Ridge Trail and surrounding areas.

This story has been corrected to show the fire spread to over 20 acres, not 50 acres.

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