(CNN) — The manager of a Virginia Walmart who killed six people and himself in a shooting Tuesday night has been identified as Andre Bing, 31, tweeted the city of Chesapeake.

“He was armed with a handgun and had multiple magazines on his person,” the city statement said.

Five of the deceased victims were identified as Lorenzo Gamble, 43; Brian Pendleton, 38; Kellie Pyle, 52: Randall Blevins, 70; and Tyneka Johnson, 22, according to a press release released Wednesday by the City of Chesapeake.

The sixth victim was a 16-year-old boy whose name authorities are not identifying because he was a minor, the city said.

“The City of Chesapeake has always been known as the ‘City that Cares’ and now, more than ever, we know our City will be there and care for those who need it most,” the statement said. “Please join us in praying for the family and friends of these community members we have lost.”

Bing was a “team leader” on the night shift for the Walmart in Chesapeake, Virginia, the source familiar with the matter told CNN.

His coworkers said a quiet shift at the Walmart Supercenter turned into a night of horror, bloodshed and tragedy.

The deadly attack began around 10:12 p.m., less than an hour before Walmart Supercenter closed.

Employee Kevin Harper said he had just left the room when a colleague walked in and started shooting.

“He just had just come out of the break room … (the shooter) started trapping people in there,” Harper said in a Facebook Live video. The video is no longer on her Facebook page, but has been re-shared on social media.

“He just went in and started shooting,” Harper said. “I feel sorry for the victims.”

The motive for the attack remains a mystery.

Four people who were injured in the shooting remain hospitalized as of Wednesday morning, Chesapeake Police Chief Mark Solesky said. At least two were in critical condition, said Dr. Michael Hooper, vice president and chief medical officer at Sentara Norfolk General Hospital.

Investigators scoured the store overnight Wednesday looking for victims or people who may have been hiding, Chesapeake police spokesman Leo Kosinski said.

“Three people, including the shooter, were located dead in the store’s break room,” tweeted the city of Chesapeake. “A victim was located dead towards the front of the store. Three other victims were transported to local hospitals for further treatment, but succumbed to their injuries.”

The Thanksgiving week attack marks another mass shooting in a location traditionally seen as safe, from schools to hospitals to stores.

Just 170 miles (273 kilometers) west of Chesapeake, a 22-year-old student at the University of Virginia in Charlottesville allegedly opened fire on his companions this month and killed three of them on a bus returning to campus from a field trip to Washington.

Last weekend, a 22-year-old shot and killed five people at an LGBTQ nightclub in Colorado Springs, Colorado, wounding 19 others, authorities said.

Veteran recounts how he helped subdue alleged shooter in Colorado 2:11

The United States has suffered more than 600 mass shootings so far this year, according to the File of Armed Violence. Both the nonprofit organization and CNN define mass shootings as those in which four or more people are shot, not including the assailant.

Strange and threatening behavior

Several co-workers of the Walmart supervisor said the attacker had exhibited strange and threatening behavior in the past.

Bing was brusque with his coworkers and went so far as to express paranoid views about the government, according to interviews with coworkers.

“He said a lot of disturbing things,” said Donya Prioleau, who said she was in the employee break room when Bing walked in and unexpectedly opened fire.

“We don’t know what led him to do this,” he said. “None of us can understand why it happened.”

She said Bing “came in, shot three of my friends…before I ran out. Half of us didn’t believe it was real until some of us saw all the blood on the ground.”

In the past, Prioleau said, Bing has been “condescending when talking to us. He didn’t have good communication skills. He was pretty mean to a lot of us.”

Shaundrayia Reese, who worked with Bing from 2015 to 2018, described him as a loner.

“He always said that the government was watching him. He didn’t like social media and he had black tape on his camera phone. Everyone always thought there was something wrong with him,” Reese said.

A video Reese said she took in 2016 shows a man — whom she identified as Bing — talking to people before realizing he was being filmed and walking away.

“He didn’t like being recorded,” Reese said. “He was always afraid that the government was listening.”

Joshua Johnson, who worked as a maintenance worker at the store until 2019, also told CNN that Bing had issued sinister threats if he ever lost his job.

“He said if he ever got fired from his job, he would retaliate and people would remember who he was,” Johnson said.

Neither Johnson nor Reese informed management of any concerns about Bing, they said.

According to Johnson, Bing was having problems with some of the maintenance workers and was threatening to sue them if they didn’t follow his orders.

“Is [tragedia] It’s especially painful”

Joetta Jeffery said her mother, Betsy Umphlett, sent her text messages from inside the store saying bullets were flying through the air.

“I’m crying, I’m shaking,” Jeffery told CNN. “I had just talked to her about buying turkeys for Thanksgiving, then this text came through.”

Police on Wednesday continued to process the scene of a Tuesday night mass shooting that killed six people at a Walmart in Chesapeake, Virginia.

Jeffery said his mother is not injured, but rather traumatized by the tragedy.

A reunification center has been set up at the Chesapeake Conference Center for families seeking details about their loved ones who were in the store. City officials have asked that only family members or emergency contacts of people inside visit the center.

John Furner, president and CEO of Walmart US, said the mass shooting in Chesapeake was uniquely tragic because the shooter was an employee.

“We feel tragedies like this personally and deeply. But this one is especially painful because we learned that the attacker was a Walmart associate,” Furner said in a statement. “The entire Walmart family is heartbroken. Our hearts and prayers go out to those affected, and we are grateful for the actions of first responders.”

The FBI’s Norfolk Division said the agency is assisting the Chesapeake Police Department in the investigation.

Authorities are asking anyone with information about the shooting to call 1-800-CALL-FBI.

Amanda Jackson, David Williams, Michelle Watson, Chris Boyette, Holmes Lybrand, Dave Alsup, Joe Sutton, Braden Walker, Lauren Koenig, Brian Todd, CNN’s Andy Rose contributed to this report.