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A 9-year-old boy who was struck by a tree falling on a tent during a severe storm in the Boundary Waters Canoe Area Wilderness was evacuated late Tuesday night, authorities said.

Search and rescue crews reached the boy by boat and transported him to a waiting ambulance around 11 p.m., said Cook County Sheriff Pat Eliasen. The area was under a flood warning after torrential rains soaked much of the state.

The boy's condition was not immediately known.

The sheriff had no additional information to share about the rescue.