A three-alarm fire displaced 20 people in Philadelphia on March 11.

Firefighters were called to 6200 Arch Street around 9:30 a.m. and found heavy smoke and fire in the rear of  two-story building.

The fire started to spread to nearby homes and the second and third alarms were called.

A defensive attack was ordered when parts of the main fire building started to collapse.

The fire was placed under control in about two hours.

The Red Cross was called in to assist 20 residents who were displaced.