Downey Fire authorities are investigating the cause of a two-alarm fire that destroyed a commercial building at 10727 Paramount Blvd. early Thursday morning. Dispatchers received a call of reported smoke at approximately 2:30 a.m. Firefighters were forced to evacuated the building and were ordered off the roof as heavy fire consumed the one-story office building’s attic space.

With help from neighboring fire departments in Santa Fe Springs, Montebello, Vernon and L.A.County, firefighters used hand lines, a wagon battery and two ladder pipes to douse the flames.

There were no reported injuries, although the building was a near total loss.

The cause of the fire remains under investigation.