A two-vehicle accident late yesterday afternoon in Ashland County remains under investigation.  It happened at around 5pm on County Road 620, near Township Road 580.  According to the Highway Patrol, 52-year old Dennis Hollis, of Wadsworth, was eastbound when his pickup truck went left of center, striking a van head-on, driven by 39-year old Graeme Clark, of West Salem.  Both drivers were taken to the hospital with non-life threatening injuries.  The patrol says alcohol is considered to be a factor in the crash.