The Black Hebrew Israelites are known for their inflammatory sidewalk ministers who employ provocation as a form of gospel, preaching a theology that says the chosen ones are black, Native American and Hispanic people.

Now, it has emerged that one of the two suspects in Tuesday’s attack on a kosher market in Jersey City that ended with the death of six people, including a police officer, appears to have been connected to the group, a law enforcement official said.

That suspect, David N. Anderson, 47, was killed inside the JC Kosher Supermarket, along with the second suspect, Francine Graham, 50, officials said. Mr. Anderson, the law enforcement official said, had posted anti-Semitic and anti-police screeds on internet forums in the past.

A manifesto-style document was found in the van that the assailants abandoned in the parking lot of the supermarket. But the official said it was rambling and gave no clear motivation for the attack.