A three-alarm fire that broke out Monday morning at a building in downtown Oakland has left six people with injuries, including one firefighter, and three were taken to the hospital for smoke inhalation.

The fire began around 7:15 am at a five-story, 43-unit building at 19th and Broadway in Oakland, as KTVU reports. The address appears to be 1770 Broadway, but the fire appears to have been confined to a rear portion of the building on the 19th Street side, above Gai Noi, a Thai restaurant.

The ground floor of the building is also home to Dope Era, a clothing store owned by legendary Oakland rapper Mistah F.A.B., per NBC Bay Area.

As Mistah F.A.B. told KTVU, "My store is the least of my worries. I think the most important thing is to make sure that everyone's evacuated safely, that there's no deaths and whoever was affected, that they're okay."

Five building residents were treated at the scene for injuries, and three of them were taken to an area hospital to be treated for smoke inhalation, as KTVU reports. One firefighter also suffered a minor injury.

As Oakland Fire Chief Damon Covington tells the Chronicle, the fire appears to have begun on the second floor of the building and spread to the floors above it.

Residents described thick black smoke pouring down the hallways of the building.

The fire was reportedly brought under control as of 8:40 am.

The cause of the fire is under investigation.