BOSTON (AP) -- Authorities say there were no reported injuries in an eight-alarm blaze in a commercial building in Boston that firefighters quickly brought under control.

An alarm-monitoring company reported the fire at about 4:30 a.m. Tuesday.

The fire was under control by about 6 a.m. with firefighters dousing hotspots.

According to broadcast reports, the five-story brick building on Summer Street in South Boston's "Innovation District" was undergoing renovations.

There were reports of some people in the building, but they made their way out a back entrance.

Firefighters attacked the blaze from outside because of uncertainty over the integrity of the building.

Traffic was diverted from the area.

There was no word on a cause.