State Police say a fatal accident during a charity toy run in Augusta was caused by a different motorcycle rider than they'd originally believed.

The United Bikers toy run had just left the Augusta Civic Center parking lot, with hundreds of motorcycles lined up in the travel lane of I-95, with all other vehicles being driven in the passing lane. Troopers say a motorcycle driven by 25-year-old Aaron White-Sevigny of Windsor veered into the passing lane and collided with a pickup truck, setting off a chain reaction. Both White-Sevigny and 58-year-old Jamie Gross were killed in the accident, while two other bikers were injured.

The truck's driver, 67-year-old William Nuson, swerved to try and avoid hitting the bike, and ended up tipping the truck on its side. He and his 99-year-old mother Anna suffered minor injuries in the accident.

Police continue to investigate what caused White-Sevigny's motorcycle to veer into the adjacent lane.