Police officer among six dead after Jersey City standoff, officials say.

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.
Two suspects were also killed, Jersey City Police Chief Michael Kelly told reporters.

Seals, a 15-year veteran of the department, was a member of the Cease Fire Unit, per the unit's website. It's part of a statewide anti-violence program aimed at limiting gun crimes through community outreach and the confiscation of illegal weapons.
"He was our leading police officer in removing guns from the street," Kelly said. "Dozens and dozens of handguns, he is responsible for removing from the street."
Seals was a 15-year veteran of the department.
Seals previously worked in the South District, which has a high volume of violent crimes, Kelly said. He was promoted to detective in the last couple of years.
The officer killed Tuesday is believed to have been ambushed, a law enforcement source told CNN Tuesday.

According to Kelly, authorities removed a stolen U-Haul vehicle from the scene. It could contain and incendiary device, he said. It's currently being examined by the department's bomb squad, Kelly said.
New Jersey Gov. Phil Murphy praised Seals for his service in a brief news conference Tuesday evening, saying, "He gave his life in the line of duty and in the name of service to his community."
"Our sadness comes with an immense debt of gratitude for his service and sacrifice. Our condolences are with his wife and children and theri entire family in this extraordinarily tough time," the governor said.
At least two other police officers were injured in the shooting. They were treated at a local hospital and later released, Kelly said.