Building fire in downtown St. Louis

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ST. LOUIS, MO (KTVI) - Firefighters are working to put out a fire at 1st and Barton. There were reports of two people inside the building and an explosion. It does not appear that there is anyone in the building at this time.

The St. Louis Fire Department says that paper, wood and other materials is currently burning the building. They have been at the structure before.

The building has been vacant for some time. The last time fire crews were at the building was because people were inside and a lit a fire.