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A warehouse packed with propane tanks bursts into flames on Chicago’s northwest side Friday morning, and some of those tanks exploded.

The extra-alarm fire erupted at a storage facility at Grand and Latrobe in the Hanson Park neighborhood just after 9 a.m.

The flames caused two roofs to crash-down, and sent thick, black smoke into the sky.

Despite the bitter cold temperatures and frozen water lines, firefighters had the blaze under control in about an hour. The hazmat team also responded to the scene, and the area around the facility was evacuated.

“We went defensive from the get-go, and started setting up our big guns, our tower ladders and snorkels, and that’s how we fight a fire defensively… keeping people away… out of the collapse zone,” said Chief Pat Brennan of the Chicago Fire Dept.

The warehouse belongs to “Advanced On-Site Conrete.” The company is family-owned, and has been there since 1985.

Fortunately, no was injured. An investigation is underway into what caused the blaze.

WGN News Writer C. Hayes published this story.