Authorities are still trying to determine what caused a tree branch to fall at a southern New Jersey campground, killing a 3-year-old Bronx girl who was inside a tent.

State police announced Monday that Ellys Martinez died in Saturday's accident at Yogi Bear's Jellystone Park in Alloway Township.

Police say the girl was inside a tent with others when she was struck. She was taken to a hospital but was pronounced dead there a short time later.

Park officials released a statement about the incident, which said in part, “Providing a safe camping experience is always our priority, and we are heartbroken. We are cooperating with the local authorities in their investigation, and are deeply saddened by this event."

Strong storms were passing through the state on that day, but it's unclear whether the weather played a part in the accident.

No other injuries were reported in the accident.

The Associated Press wire services contributed to this report.