HARRISON - Officials say five firefighters were injured battling a five-alarm fire in Harrison today.

Fire officials say one of the firefighters was cut badly when a backdraft set off a massive explosion, caught on camera by one of our viewers. The firefighters were blown from the second floor down to the street below during the explosion.

Investigators say a passing police officer noticed smoke billowing out of 602 and 604 Frank E. Rodgers Blvd. at around 11 a.m. The fire quickly spread to adjoining buildings and into a vacant restaurant on the corner of the street.

Emergency crews then evacuated the building, which houses numerous families in three apartments. Up to 20 people have been displaced by the fire. The Red Cross says it was on the scene to help those affected.

It took nearly six hours for firefighters to get the flames under control.

Officials say one of the injured will remain hospitalized overnight.