Fire officials are identifying a Maryland couple and their twin grandchildren who were killed in a house fire.

Officials say firefighters pulled four people from the burning home early Tuesday in Chillum.

At a news conference, Prince George's County Fire Chief Marc Bashoor said the grandparents died at the scene and the twins were taken to a hospital, where they died. He identified the children as 2-year-old Anna and Israel Omijie and their grandparents as 55-year-old Caroline Omogbo and 63-year-old Samson Omogbo.

Bashoor says the twins' mother jumped from a second-floor window, but her injuries are not life-threatening.

Bashoor says there's no sign of a smoke alarm in the home. He says the cause is under investigation, but so far there's no evidence of foul play.