The Palisades Parkway reopened Friday afternoon following a deadly crash at the New York-New Jersey line. 

Police said two vehicles crashed just before 6 a.m. in Alpine, New Jersey. One person was killed, and several others were treated for injuries. 

Chopper 2 flew over the scene, where one car was seen on its side and traffic was backed up. The cause of the crash remains under investigation. 

The parkway was closed in both directions for the morning commute, and drivers were told to take Route 9W as an alternate.

The Palisades Interstate Parkway is a 42-mile stretch from the George Washington Bridge in Fort Lee, New Jersey to Bear Mountain Bridge in Rockland County, New York.