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CHICAGO – A Chicago firefighter jumped from the roof of one building to another one while battling a massive blaze Friday morning, video shows.

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Crews responded to a fire around 7 a.m. at a building in the Bridgeport neighborhood, WGN reported.

Video shows firefighters scrambling down ladders. Another firefighter was stranded on the roof and jumped to the adjacent building for safety.

At least four firefighters suffered non-life threatening injuries, WGN reported.

The cause of the fire is under investigation.