Residents of an apartment building in Winthrop survived a fire that struck four alarms, sending mutual aid from surrounding communities to battle the blaze.

Winthrop Police and Fire received the first reports of fire at the apartment building at 91 Veterans Road at 12:18 p.m. Friday. At the scene, the building was surrounded with heavy smoke and flames were visible.

“Crews worked aggressively to extinguish the fire and struck a fourth alarm calling additional mutual aid to the scene. Multiple residents were entrapped and have since been safely rescued from the building,” the agencies wrote in a joint statement later that day.

Some residents were transported to local hospitals, though authorities none were thought to suffer life-threatening injuries.

In all, about 110 people were displaced and were receiving assistance from the Red Cross.

Other survivors include at least one dog seen at the scene named Petey.

Emergency crews shut down Shirley Street, which runs parallel to Veterans Road, as well as the cross street, which is Hadassah Way to the west of Shirley and Coral Avenue to the east of Shirley.

Mutual aid was provided by the fire departments of Lynn, Chelsea, Malden, Saugus and Revere, according to the Winthrop Police and Fire statement. The State Police and Port Authority assisted at the scene.

The cause of the fire is under investigation.