State Police are investigating fatal accident on Route 55 in Millville Thursday that killed an inmate traveling in a Department of Corrections van and injured three others.

Police say the accident occurred on the southbound side of Route 55 in Millville around 1:45 Thursday afternoon.

According to a preliminary investigation, a Bayside Prison State Department of Corrections van, which was occupied by two corrections officers and two inmates, hit a flatbed truck at milepost 24.9 of Route 55, near the interchange with Route 49. Both inmates were transported to Inspira Medical Center in Vineland where one was pronounced deceased; the other inmate remains hospitalized. Both corrections officers were transported to Atlantic City Medical center with serious injuries

The crash remains under investigation and no further information is yet available.