Twenty-one people have been displaced from their homes as a result of last night's four-alarm fire in Dundalk.

The fire, which involved four townhomes in the 100 block of Highshire Court, 21222, remains under investigation by BCoPD fire investigators.

Fire officials will conduct a neighborhood "after the fire" walk this evening, October 9, to answer questions from residents about fire safety. Fire personnel will begin the walk around 6 p.m.

BCoFD fire units were dispatched at 10:46 p.m. Tuesday for a working dwelling fire that escalated quickly as fire spread across the rooftops of the townhomes. Commanders subsequently called for second, third and fourth alarms that ultimately brought more than 30 pieces of apparatus to the scene.

Firefighters from Baltimore City and Anne Arundel County responded under mutual aid agreements. BGE and the Maryland Department of the Environment also responded.

First-arriving crews found smoke showing from the front of a townhome and found the rear of the home fully involved.

One civilian was injured and evaluated at the scene , but declined transport to a hospital.

At about 11:07 p.m.,  a "Mayday" was called when a career firefighter fell through the roof. The firefighter self-extricated within minutes and was evaluated by EMS crews at the scene. He was not seriously hurt.

The fire was knocked at 11:29 p.m.

The Red Cross responded to assist the displaced residents.