Firefighters were called to the two-unit structure at about 2 a.m. and extinguished the smoldering blaze in about an hour-and-a-half, Allentown Fire Department Assistant Chief Lee Laubach said.
The fire appeared to be electrical in nature and was largely contained to the walls of the building, he said. It caused minor damage, but residents cannot stay there because the structure is without electricity and heat, the chief explained.
No one was injured in the fire, Laubach said.
The American Red Cross of the Greater Lehigh Valley is providing food and lodging for three adults and one child displaced by the fire, according to a news release.
Contact Lehigh County suburbs reporter Precious Petty at 484-894-3854 or email@example.com.