A fire broke out Monday night just after 6 p.m. under the northbound lane of U.S. Interstate 35 near the Mesaba and Superior Street exit ramp. Crews from the Duluth Fire Department worked to contain the flames and spent about an hour and 20 minutes to put it out.

Thick smoke emerges from a fire under the northbound Interstate 35 exit ramp to Mesaba Avenue and Superior Street on Monday, Oct. 18, 2021. 
Contributed / Duluth Fire Department
Thick smoke emerges from a fire under the northbound Interstate 35 exit ramp to Mesaba Avenue and Superior Street on Monday, Oct. 18, 2021. Contributed / Duluth Fire Department

According to Duluth public information officer Kate Van Daele, the fire was in a homeless encampment under the ramp. Members of the Duluth Police Department and Minnesota State Patrol assisted the fire crews to search areas unaffected by the fire to ensure to that anyone left in the area was safe. No one was found in the fire scene, and no one was injured, according to a fire department news release.

An Ames Construction crew in the area at the time assisted the fire department by providing water from their tanker truck to put out the flames.

A variety of debris was found under the structure and firefighters removed several propane tanks. One of the tanks had released propane which had accelerated the flames, the release said.

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The fire remains under investigation by the Duluth Fire Marshal's Office.

This story was updated with further information from the Duluth Fire Department at 8:43 p.m., Oct. 18, 2021. It was first published at 7:08 p.m., Oct. 18.