Seven children among 13 people dead in Philadelphia house fire

• Large fire broke out at three-storey rowhouse in Fairmount
• Officials say four smoke detectors in building were not working

A large house fire in Philadelphia early on Wednesday killed 13 people, including seven children, and sent two people to hospitals, fire officials said.

Officials said at a news conference later in the morning that there were four smoke detectors in the building but that none were operating.