New Jersey State Police on Sunday located a downed aircraft in the Bass River State Forest, secured the site and turned the investigation over to federal officials, police said on Facebook.

The National Transportation Safety Board and Federal Aviation Administration had arrived at the crash site by Sunday evening and were beginning an investigation.

NJSP Aviation and Urban Search and Rescue Units had been scouring the area after the two-passenger aircraft did not arrive at its intended location on Saturday night. The airport the plane departed from or the plane's intended location were not immediately known. It was also not known how many individuals were on the plane or what may have caused the incident.

Officials tracked the aircraft pilot’s cellphone, leading them to the location where the plane went down. Police initially responded to the state park at about 11 a.m. local time.

A helicopter located the plane about four hours later and police rescue teams began racing to the scene.

Bass River State Forest is a nearly 24,000-acre park in Burlington County. It’s about 30 miles north of Atlantic City.