A 27-acre wildfire believed to be caused by human activity near Ely in the Boundary Waters Canoe Area Wilderness was 25% contained Sunday morning, according to the U.S. Forest Service.

The Wood Lake fire was discovered about 10 a.m. Tuesday on an island on Wood Lake, a news release from the U.S. Forest Service and the Superior National Forest said. It caused the closure of an entry point on the lake as well as several nearby lakes and portages.

"Firefighters made good progress yesterday with higher humidity levels, continuing to reinforce the fire's containment line," the news release said Sunday, noting that firefighters are making contingency plans around Moose Lake.

Firefighters from Connecticut are assisting in fighting the fire.

The fire is under investigation, and Superior National Forest law enforcement officials are seeking any information about how the fire started.