A week after the violence at the Empire State Building, another workplace shooting erupted in the early morning hours Friday at a New Jersey grocery store, where three people including the gunman are dead. Details are still being sorted, but the incident occurred around 4 a.m., before the store opened, at a Pathmark in Old Bridge, about 25 miles outside of New York. ABC reports that the suspect was a male in his 20s, a current or former employee, and one of his victims was an 18-year-old woman, according to NBC. The gunman, the town mayor said, was an ex-Marine and died of a self-inflicted gunshot wound.

The Asbury Park Press reports:

[T]he ex-marine, also an Old Bridge resident, had worked at the store for about two weeks. He left the store this morning, and then returned a short time later, dressed in camouflage and armed with an AK-47 and an automatic pistol, the mayor said.

He killed two co-workers, a male and a female, before turning the gun on himself.

Update: The shooter has been identified as 23-year-old Terence S. Tyler, formerly of Brooklyn, who served in the U.S. Marine Corps from 2008 until 2010. A law enforcement source told NBC that Tyler may have had a history of mental illness. A Facebook page matching his identifying information sports a profile picture reading, "Be optimistic — All the people you hate are going to eventually die."

This post has been updated throughout.