Two people were killed and two others were badly injured in a single-vehicle crash early Saturday morning in South Jersey, police said. At about 12:38 a.m., police in Deptford Township in Gloucester County were called to the 500 block of Fox Run Road for a report of a car crash. At the scene, investigating officers determined that the sole vehicle involved in the collision had four people inside, officials said. Two of the occupants were pronounced dead at the scene, while the other two were transported to Cooper University Hospital, where they remain in critical condition late Saturday mornin…