PORTLAND, Ore. — Fire gutted a former Portland fire station that was built more than a century ago and has been vacant for many years.

Portland Fire & Rescue says crews responded Friday morning to the brick building in the Old Town Chinatown neighborhood. Firefighters found flames burning through ground-floor windows on the back side of the building, and the blaze spread to the second floor.

The cause of the fire remains under investigation.

The neighborhood includes many homeless, and callers reported seeing homeless people running from the building that was designated as unsafe in 2010. Firefighters found no victims inside.