BRUNSWICK — Brunswick police are investigating the cause of a motorcycle crash that sent one man to Maine Medical Center with unknown injuries.

Police said 62-year-old Stephen Collins Jr. of Rocky Hill Road in Brunswick was riding north along River Road when his bike left the road and hit a ledge wall.

The accident took place around 2:30 p.m. Thursday.

The medical condition for Collins, who was being treated at the hospital’s emergency room Thursday, was unavailable.