At least six people were killed in a shootout at a kosher food store in Jersey City, New Jersey, on Tuesday afternoon, officials and local media said.

Five people — three members of the local Jewish community and two suspected assailants — were pronounced dead inside the JC Kosher Supermarket on Martin Luther King Drive and a police detective also died in an exchange of gunfire in which hundreds of rounds were fired.

Jersey City Police Chief Michael Kelly said he believed the dead were all struck by gunfire from the suspects, who arrived at the scene in U-Haul truck and held police at bay around the store for hours in a deadly standoff.

“Their movement was rapid and continuous for four hours within that area,” the chief said.

According to police, there was no immediate evidence the bloodshed was terror-related.

Two more police officers and a civilian were wounded in the shootout but were in stable condition, the Hudson County Prosecutor’s Office posted on Twitter.

The deceased officer was a father of five, police said.

The standoff prompted a massive law enforcement deployment with local SWAT teams and federal agents rushing to the scene, as well as emergency services from the neighboring New York City Police Department.

All schools in Jersey City, which faces Manhattan across the Hudson River, were placed on lockdown which was lifted later in the afternoon, according to the mayor and local media.

Few official details of the incident were immediately available. But local media reported the confrontation between suspects and police started in or near a cemetery and was linked to a previous homicide investigation.