OAKDALE - Investigators suspect excessive speed was a factor in a car crash that killed four people in Vernon Parish.

A State Police statement says an unidentified driver lost control of a pickup truck early Saturday before the vehicle veered off Highway 10, struck several trees and burst into flames.

The statement says all four occupants of the vehicle were trapped inside and died at the scene of the crash. Their names and ages weren't immediately released.

Police said it's unclear if the driver was impaired or if any of the passengers were wearing seatbelts.

The crash occurred around 4:15 a.m. on a stretch of the highway between Oakdale and Pitkin.