Four people, including a police officer and three people believed to be civilians, were killed during an hours-long standoff and firefight Tuesday between two suspects and law enforcement in Jersey City, New Jersey, authorities said.
The fallen officer was identified as Det. Joseph Seals, a 15-year veteran of the department, Kelly said.
Seals was part of a statewide anti-violence unit, and Kelly credited him with removing "dozens and dozens" of handguns from the street.
"We believe he was killed while trying to interdict these bad guys," Kelly told reporters, adding, "Once again, this is all being investigated."
The officer who was killed is believed to have been ambushed, according to a law enforcement source.
Two officers and one civilian were in stable condition after being struck by gunfire, Hudson County Prosecutor Esther Suarez said via Twitter. The wounded officers were identified by Kelly as Ray Sanchez and Mariela Fernandez. They were both treated and released.
Hours after the first gunshots, the details of what led to the incident and how it unfolded remain unclear.
The gunplay went on for hours
The shooting began at about 12:30 p.m. ET and drew reinforcements from neighboring jurisdictions, police said, virtually shutting down commerce in some areas and forcing schools to go on lockdown.
CNN affiliates reported the shooting occurred in the area of Martin Luther King Drive in Jersey City, across the Hudson River from Manhattan.
The chaotic scene unfolded on city streets, where bursts of gunfire and blaring sirens were heard as heavily armed officers moved in, according to footage shared on social media.
Continuous gunshots could be heard in Jersey City for at least 20 seconds prior to 2 p.m., according to a CNN producer at the scene. At least three armored personnel vehicles were on scene, the producer said. Paramedics responded as helicopters hovered overhead.
The gunplay continued for hours before authorities announced the suspects had been killed during a standoff with police in another part of town.
A source said earlier that at least one shooter was "neutralized" inside a bodega. Law enforcement sent in a robot to have eyes and ears inside the store where the shots were fired, the source said.
The investigation will take weeks and could stretch on for months, Kelly said. "The crime scene is very extensive," he told reporters, "and is at three locations, at least."
Part of the investigation involves a stolen U-Haul truck, which Kelly said may contain an incendiary device and was being examined by the bomb squad.
There is no indication of terrorism, Jersey City Department of Public Safety Director James Shea said.
The ATF office in Newark tweeted Tuesday that agents responded to "reports of an active shooter."
The New York Police Department's Emergency Service Unit also responded, according to a law enforcement official familiar with the incident.
No one was in custody in connection with the shooting, according to a law enforcement official.
In a brief news conference Tuesday evening, New Jersey Gov. Phil Murphy praised the efforts of law enforcement, who "responded to this incident not knowing what they were entering, or if they would even make it out."
"If not for them," Murphy said, "I shudder, we shudder to think about how much worse today could have been."
The New Jersey State Police Benevolent Association tweeted: "We need a lot of prayers right now for Jersey City officers. Keep all those involved in your thoughts."
Detective Joseph Seals
David Anderson, 47, and Francine Graham, 50
kosher grocery store
Seals’ death touched off a day of carnage in the city that ended three hours later with five more people dead -- three victims at a kosher grocery store and the two gunmen. After killing Seals, Anderson and Graham drove their stolen U-Haul van about a mile to a kosher supermarket on Martin Luther King Drive and started firing at the store, killing Leah Minda Ferencz, 33, who owned the grocery store with her husband; Douglas Miguel Rodriguez, 47, a store employee; and Moshe Deutsch, a 24-year-old rabbinical student.
A funeral mass will be said for Seals at 11 a.m. Tuesday at Saint Aedan’s Church at 800 Bergen Ave. in Jersey City.
Jersey City Chief of Police Mike Kelly
Jersey City Deputy Chief Edgar Martinez
Rep. Mikie Sherrill,
ersey City Det. Joseph Seals at the McLaughlin Funeral Home,
Hudson County Prosecutor Esther Suarez
Rep. Tom Malinowski,
Rep. Josh Gottheimer,
Jersey City Deputy Chief Edgar Martinez
kosher market kosher grocery store
The 49-second video shows the white van pull up alongside the curb on the opposite side of Martin Luther King Boulevard.
Leah Minda Ferencz, 33, who owned the store with her husband, and Moshe Deutsch, 24, were killed in the store, according to Rabbi Moshe Schapiro, who is co-director of the Chabad of Hoboken and Jersey City synagogue and acting as an informal spokesman for the local Hasidic community.
Miguel Jason Rodriguez, 49, was the third victim of the shooting, according to Williams Machazek, of Iglesia Nueva Vida.
NBCNewYork.com identified the shooters as David Anderson and Francine Graham.
A vigil for the shooting victims is planned for 7:30 p.m. Wednesday at Temple Beth-El on Kennedy Boulevard in Jersey City.