Authorities in Jersey City, New Jersey, confirm six people, including a police officer, three bystanders and two suspects were killed in an eruption of gunfire Tuesday afternoon.

They say two more officers, including one that has been shot in the shoulder, and at least one civilian were wounded. They were all in stable condition. 

The deceased police officer was Joe Seals, a father of five, mayor of New Jersey had mourned him on Twitter.

Other five people, including two suspects, were found dead in a building, the city's Police Chief Michael Kelly said.

Authorities say there were no initial indications it was a terrorist attack, but the investigation is ongoing.

The two suspects, a man and a woman, opened fire as they reportedly barricaded themselves in the kosher grocery store. 

While preliminary local media reports indicated the incident began when a police officer was shot dead when approaching one of the suspected shooters over an investigation of an earlier homicide. The suspects then fled in a truck and eventually ended up at the shop. 

The fire exchange between law enforcement and shooters lasted for hours, according to local media. 

About a dozen schools in the area were put on lockdown shortly after police responded to the shooting situation. 

All the students were safe, Superintendent of Jersey City Schools Frank Walker said. 

New Jersey is located just across the Hudson River from New York's Manhattan.

(With input from agencies)