PISCATAWAY, N.J. — A tense encounter in Piscataway, New Jersey, ended with police shooting a knife-wielding suspect, who was later found alongside three other deceased individuals inside a residence, authorities reported on Monday.

Law enforcement officers from the Piscataway Police Department rushed to a River Road address at approximately 5:30 p.m. This came after they received an emergency call from a man reporting an individual armed with a knife.

Upon arrival, officers were confronted by a man who charged at them brandishing a knife, as relayed by law enforcement sources to WABC-TV. Despite using Tasers in an attempt to subdue him, the efforts proved futile.

The suspect continued his aggressive advance toward the officers, prompting them to fatally shoot him in self-defense.

Following this confrontation, officers discovered three more individuals dead inside the home, officials confirmed.

According to law enforcement sources, they include two grandparents. It’s not yet clear who the fourth individual is, or the relationship between the suspect and the victims.

The Middlesex County Prosecutor’s Office and the New Jersey Attorney General’s Office are investigating their deaths, and said it appeared to be an isolated incident and that there is no indication of an ongoing threat to the community.

New Jersey State PBA President Peter Andreyev released a statement in response to the incident, saying, “We are aware of the horrific crime in Middlesex County tonight. All our members that were involved are ok and being evaluated. Thank you to all who have reached to offer support.”

Neighbors were alarmed by the massive police scene.

“I was pretty much about to start making dinner, and then I just heard the cops come next door,” said neighbor Jessica Conroy. “I looked outside the window, and they had their weapons drawn, and then we heard the shots go off.”

Neighbors told WABC that they had nice encounters with those who lived at the home in the past.

“Very nice, lady. Very nice, quiet neighborhood. It’s so tragic that something like this happens,” said neighbor Keith Heron.