PHILADELPHIA - FIREFIGHTERS say a house fire in Philadelphia has killed seven people, most of whom were found huddled together in the basement.

They say the dead are four adults and three children, including a 1-year-old.

Four people survived the fire.

Fire Commissioner Lloyd Ayers says the fire broke out on Friday night at a three-story brick home in a working-class neighborhood in the southwest section of the city, close to the Philadelphia International Airport.

The cause of the fire hasn't been determined.

But firefighters say there were no smoke detectors in the home. -- AP