A five-alarm fire tore through a Mattapan three-decker on a warm Thursday night, displacing 19 people and causing half a million dollars in damage, Boston fire officials said.

Firefighters responded at 7:47 p.m. to 41 Evelyn St. to find heavy fire in the rear of the four-family, three-decker house, according to the Boston Fire Department on Twitter.

No one was injured in the fire, which blazed during an 85 degree evening, the fire department tweeted.

The Red Cross responded to assist with the 19 displaced residents, including four children.

A fifth alarm was ordered around 8:15 p.m. “for rehab purposes,” the department said. With the bulk of the flames knocked down 15 minutes later, firefighters continued to chase hot spots.

The fire department estimated initial damage at $500,000. The investigation is ongoing.