An assailant involved in a prolonged firefight in Jersey City, New Jersey, that left six people dead, including one police officer, had published anti-Semitic and anti-police posts online and investigators believe the attack was motivated by those sentiments, a law-enforcement official familiar with the case said Wednesday.

The official said the names of the two suspects were David Anderson and Francine Graham. Anderson appeared to have a connection to the Black Hebrew Israelite movement, which is designated as a hate group by the Southern Poverty Law Center, a legal advocacy group that tracks such movements.

The extent of Anderson’s involvement in that group remains unclear, the official said. The Black Hebrew Israelites have no connection with mainstream Judaism.

Investigating a connection to the Black Hebrew Israelites.

Investigators also found a manifesto-style note inside the assailants’ van, the law enforcement official and another official familiar with the case said.

The document, which was described as brief and “rambling,” suggested no clear motive for the shooting. Investigators also found a live pipe bomb inside the vehicle, the law-enforcement official said.

The law-enforcement official could not provide more details about the suspect’s online posts or where they had been published. He said investigators were still reviewing that information.

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None of the three victims inside the store have been publicly named by officials, but multiple people connected to the Jewish community in Jersey City have identified two of them as Mindel Ferencz, 33, the wife of the market owner, and Moshe Deutch, a 24-year-old rabbinical student who lives in Brooklyn.

The Jersey City police officer who was killed was identified Tuesday as Detective Joe Seals, a 15-year law-enforcement veteran and a father of five.

Before the gunbattle, there was a shooting at a cemetery.

Seals approached the two assailants, a man and a woman, who were inside a U-Haul van at a cemetery near the kosher market because the van had been linked to a homicide over the weekend, according to the law-enforcement official. The official did not have any more details on the homicide.

Video surveillance footage shows the assailants shooting the detective and then driving away and ending up in front of the kosher market, where they park and enter the store guns firing, the official said.

For much of at least the next hour, residents nearby — and blocks away — could hear rapid bursts of gunfire coming from the area around the market.

Two members of the Hasidic community were killed.

Hasidic community leaders on Wednesday morning identified the two members of their community who were killed inside the kosher market.

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Ferencz, the market owner’s wife, was working at the store at the time of the attack.

About five years ago, she and her husband were among the first Hasidic Jews to relocate to Jersey City from Williamsburg, Brooklyn. The couple had three children, said Rabbi Mordechai Feuerwerker, a leader in the Jersey City Hasidic community.

“I’ve cried my eyes out already. I’m feeling pretty broken,” said the victim’s mother-in-law, Victoria Ferencz, 72, who heard the news Wednesday morning from Jewish media. “I feel sorry for my son. She’s going to heaven, but he and his children will have it hard.”

At the time of the shooting, her son had gone to a nearby synagogue, she said. Shots rang out and the synagogue was put on lockdown.

Her daughter-in-law had been tending the market.

“I called my son, he says, ‘I’m locked here. I have no idea where she is,’” Ferencz said.

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Another victim was Deutsch, the 24-year-old rabbinical student.

In Manhattan, at a news conference at City Hall, Rabbi David Niederman, the executive director and president of the United Jewish Organizations of Williamsburg, said that Deutsch helped lead a food drive this year during the Jewish holidays and helped to feed 2,000 people.

Deutsch’s father, Abe Deutsch, is a board member of the United Jewish Organizations of Williamsburg, a large community service organization in the Satmar Hasidic community.

Niederman said he knew Moshe Deutsch personally, describing him as “extremely kind and generous” and a “go-to person when his peers needed help.”

As he spoke about the young shooting victim, the rabbi choked up.

“Can you imagine a few hundred bullets went into the body of a 24-year-old child?” Niederman said. “How can we as a people, a community, bear that?”

Detectives continued to investigate the crime scene.

On Wednesday morning, detectives were at the Jersey City Kosher Supermarket, canvassing the crime scene as a number of uniformed police officers stood watch outside.

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Authorities were alerted about a shooting at the market around 12:30 p.m., according to Jersey City’s police chief, Michael Kelly. The officers who responded were met with “high-powered rifle fire,” he said Tuesday.

On Wednesday, Jersey City Mayor Steven Fulop said that two police officers who were on a foot patrol near the grocery store were able to immediately respond to the call. Both of them were injured but in stable condition.

For more than an hour, loud bursts of gunfire rang out in the blocks surrounding the market in Jersey City, which is across the Hudson River from lower Manhattan.

Helicopters circled overhead as police officers swarmed the streets. They aimed handguns and long guns in every direction as they traveled down the street in formations, knocking on doors and rushing residents and business owners to safety.

“This is one of the biggest gunfights I’ve seen in a while,” said Willy McDonald, 67, who lives in the area. “And I’ve been in Vietnam.”

The market was part of a budding Jewish community.

The shootout and police siege overtook the Greenville neighborhood of gentrifying Jersey City — the second most-populous city in New Jersey, with about a quarter of a million residents.

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The center of the chaotic scene, the Jersey City Kosher Supermarket, caters to a small but steadily growing community of about 100 Hasidic families who have moved to Jersey City in recent years from the Williamsburg neighborhood in Brooklyn. These families, many of whom belong to the ultra-Orthodox Satmar sect, have created a budding community in Greenville, a residential area with a historically African American population and dense blocks that include a Catholic school, a Pentecostal church and a Dominican restaurant.

The opening of the kosher market three years ago signaled to some that the growing Jewish population was putting down roots in the area.

Rabbi Moshe Schapiro, of the Chabad of Hoboken and Jersey City, said the store was “a grocery that is very popular with the local Jewish community” and had “a deli counter that has nice sandwiches.”

The detective killed was a longtime police veteran.

Seals had been a police officer for 15 years, said Kelly. He rose through the ranks of the Jersey City Police Department, coming to work in the city’s busy South District.

After being promoted to detective in 2017, he was most recently assigned to a citywide Cease Fire unit, which is tasked with reducing shootings and making gun arrests in Jersey City.

“He was our leading police officer in removing guns from the street,” Kelly said Tuesday. “Dozens of dozens of handguns he is responsible for removing from the street.”

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Seals lived in North Arlington, New Jersey, a suburb about 8 miles northwest of Jersey City, with his wife and five children, the youngest of whom was 2 years old.

His mother, Deborah Ann Perruzza, 65, said that Seals graduated from Bayonne High School in 1997 and set his eyes on a career in law enforcement.

“He always wanted to be a cop,” she said.

On Tuesday, Perruzza said that when she saw news of the shootings, she had no idea her son was working. It was not long before her phone rang, with one of her sons calling to tell her to come to the hospital.

When she arrived at Jersey City Medical Center, doctors and officials told her that her son had been shot twice, including once in the back of the head.

“He was gone,” she said.