Three Prince George’s County firefighters were injured in a two-alarm fire that ripped through a house in Forestville on Saturday morning, according to a department spokesman.

The fire was first reported about 7:45 a.m. in a Cape Cod-style house in the 2900 block of Walters Lane, between Marlboro Pike and Pennsylvania Avenue. The injured firefighters were taken to the burn unit at MedStar Washington Hospital Center with injuries to their arms, wrists and ears.

Mark E. Brady, a spokesman for the Prince George’s County fire department, said two of the firefighters were treated and released from the hospital. A third remained with possible burns to his airway, Brady said.

Firefighters had initially been unable to locate the occupants. But Brady said a neighbor had seen the smoke, gotten them out safely and gave them a place to stay. Brady said one of the occupants, an 88-year-old, was taken to a hospital for observation. The other two occupants are adults.

Brady said the bulk of the fire in the 4,200-square-foot home was extinguished by 9:40 a.m. He said the house has a large two-story addition built on the back, which he said is where the fire rapidly spread.

Firefighters were ordered to evacuate the burning structure because it was deemed too dangerous, and water was being directed onto the house from the outside. A cause of the fire has not yet been determined.