Two hundred people were forced from their homes and five people were injured in a huge apartment fire at Mount Vernon.

One of the injured is a police officer who was responding to the fire before midnight Tuesday when something exploded and he suffered a minor hand cut, says Mount Vernon city spokeswoman Shannon Haigh.

Three others from the Cascade West apartments were treated for smoke inhalation at Skagit Valley Hospital.

Haigh says a man was found about two hours later and was flown to Harborview Medical Center in Seattle with burns to his airway and other parts of the body.

The three-alarm fire caused heavy damage to the top two floors of the three-story building.

About 75 of the displaced residents are being sheltered at nearby Skagit Valley College with help from the Red Cross.