Two people were killed in a single-vehicle crash early Sunday in Warren County, Pennsylvania State Police said.

Clifford Wayne Johnson, 38, of Tidioute, Pa., and Larry Miller, 39, of Titusville, Pa., were both pronounced dead at the scene following the crash on Economite Road in Limestone Township in Warren County. The crash occurred between midnight and 3 a.m., Warren-based state police said in a press release.

Johnson was reportedly driving eastbound when his vehicle left the road and struck several fence posts. The vehicle then struck a tree on its driver side, causing it to spin counter-clockwise back onto the road.

The vehicle came to rest in the eastbound lane of Economite Road. The cause of the crash was not listed by police.

Neither Johnson nor Miller were reportedly wearing a seat belt at the time of the crash, police said.