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Two suspects walked into the Norm's and demanded money from the employees. One suspect was allegedly armed with a large knife.
When the officer intervened, a suspect with the knife allegedly lunged at him, forcing the officer to fire three or four shots. The suspect was declared dead at the scene.
A second suspect fled the scene. Police are currently interviewing a person of interest who may be the second suspect.
Some patrons were heading into the restaurant when they realized the place was being robbed.
One witness said he saw a worker at the counter with his hands up.
"We just assumed there was a holdup," he said.
Police said there were a lot of people inside the restaurant at the time of the officer-involved shooting.
No one else was injured during the incident.
The Norm's location in Bellflower has had a troubled past.
Four years ago, there was another officer-involved shooting when a man in his 70s confront police. Cops shot and killed the man.
The officer involved in the shooting works for the Gardena Police Department.