Ricardo Jorge Santos, with the New Jersey State Police, is accused of shooting Semanchik and Webb before killing himself, prosecutors said. He was found dead in a white Mercedes SUV parked in Piscataway. A gun was located inside the vehicle, the release stated.

A New Jersey State Police sergeant, who once served on Gov. Phil Murphy's security detail, is suspected of killing his former girlfriend and the volunteer firefighter.

A minor, 2.7-magnitude earthquake struck in New Jersey on Tuesday, according to the United States Geological Survey. The temblor happened at 12:11 p.m. Eastern about 1 mile southwest of Hillsdale, N.J., data from the agency shows.

A relatively small, 2.7-magnitude earthquake struck near Hillsdale in northern New Jersey, according to the US Geological Survey.

Port Authority officials said they are investigating the cause of a fire that broke out beneath a PATH commuter train in Jersey City, N.J., on Monday morning.