HAMMONTON, N.J. (CBS) — New Jersey State Police say three people are dead after a car traveling eastbound on the Atlantic City Expressway overturned. Officials say only one vehicle was involved in the accident, which happened just before 3:15 p.m. on Sunday.

Investigators say after overturning, the car rolled into a wooded area.

A witness reached out to Eyewitness News and said she was right behind the car when it rolled over and veered off the road. She says other family members were traveling in another vehicle nearby and also witnessed the horrific crash.

Heartache spilled out on the side of the Atlantic City Expressway as loved ones gathered to mourn three people killed in a single car accident Sunday afternoon.

New Jersey State Police say shortly after 3 p.m. the car carrying the victims was traveling eastbound on the expressway when just after passing Hammonton, it overturned and rolled into a wooded area along the highway.

State police confirmed three people inside the car were killed.

Troopers opened and closed the eastbound lanes on and off for six hours as crews finally were about to remove the heavily damaged Honda from the woods shortly after 9 p.m.

At this point in the investigation, it’s unclear what caused the driver to lose control.

State police have not yet released the identities of the victims.