Authorities say three men died and another was injured after a boat overturned on the Allegheny River.

Officials in Clarion County, Pennsylvania, said the 21-foot boat apparently ran up on the riverbank and overturned at about 1:30 a.m. Saturday below Phillipston. Emergency officials were called at about 6:30 a.m. Saturday when someone reported a boat upside down in the river.

Waterways conservation officer Gregory Pochron, of the Fish and Boat Commission, said three men were found dead in the boat. A man in his 70s found pinned underneath the boat was reported to be conscious and alert when he was taken to a hospital in Pittsburgh.

Pochron said the accident is under investigation.

The coroner's office said autopsies are planned for Monday.