WARREN, N.Y. -- Authorities in Herkimer County continue to investigate a three-vehicle crash that killed two motorcyclists in the town of Warren Sunday afternoon.

State Police say a van was stopped on Route 20 trying to make left turn into a driveway when a motorcycle, towing a trailer, rear-ended the vehicle.

The force of the crash pushed the van into oncoming traffic and hit another vehicle, which overturned on its roof.

The motorcycle's operator and his passenger were both thrown from the bike. 

Troopers say 46-year-old Theresa Woolsey and 50-year-old Douglas Woolsey, from Brooksfield, died.

The two other drivers were taken to the hospital with non-life threatening injuries.