Damage to a Fitchburg apartment building was estimated at $500,000 after a fire early Saturday, fire officials said.
The Fitchburg Fire Department said it responded to a report of a structure fire at 4395 Crescent Road at 2:26 a.m. Police had been first on the scene and reported heavy fire and smoke showing from an balcony.
Firefighters found that flames had extended into the attic and burned through the building's roof.
Four of the eight residential units in the condo building sustained extensive fire damage, according to the report. The fire was stopped at a firewall in the middle of the building.
Officials said there were no injuries reported. One cat was rescued and is in the care of its owner, firefighters said.
The Red Cross and Salvation Army are assisting the displaced residents, Fitchburg said.
The city of Fitchburg Fire Investigation Team is investigating the cause and origin of the fire.