HOUSTON (AP) Investigators say a woman has been killed and a girl hurt by a falling pine tree in a Houston-area neighborhood.

The Harris County Constable's Office says the accident happened Sunday night during a family gathering in a backyard. Authorities say the tree was outside the fence surrounding a house, which also was damaged.

Authorities are trying to determine what caused the tree to fall.

Lt. Kenneth Key says family members heard a loud popping as the tree came down. Key says a woman who was struck died of her injuries. The injured girl was transported to a hospital. Details on her condition weren't immediately available.

Names of the pair have not been released.