At least three people including the gunman were shot and killed at a supermarket in New Jersey today. The shooting happened overnight inside a Pathmark grocery store in Old Bridge, New Jersey, just before 4 a.m. This is the fourth such incident in the US in over a month. Law enforcement officials said that it is believed the person responsible for the shooting is among the dead. At this point there is no motive attributed to the killings. Witnesses said employees from the Pathmark grocery store were inside preparing to open for business at 6 a.m.