A skydiving plane with 15 people onboard went off the end of the runway at a New Jersey airport, southeast of Philadelphia, Wednesday evening, according to the Federal Aviation Administration.

A small plane crashed near Cross Keys Airport in Williamstown, New Jersey, on Wednesday, the Gloucester County Office of Emergency Management said. The office is calling the crash a "mass casualty incident."

The plane, a Cessna 208B, went off the end of a runway as it was taking off from a small airport in Gloucester County, according to the F.A.A. Victims were being treated at the scene, officials said.