It was initially categorized as a 4-alarm fire before being upgraded to a 7-alarm fire later in the evening, according to social media statements from BCFD.Start the day smarter. Get all the news you need in your inbox each morning.

Subsurface levels were stacked with mattresses, the city's fire chief said, and the blaze had grown to seven alarms by early Tuesday.

A massive blaze in a mattress warehouse in Baltimore has been contained to the building after a response including more than 200 firefighters.