By Taylor Romine, Chris Boyette, CNN

(CNN) — Police have identified the suspected gunman accused of killing three people, including a child, in a shooting in a Target parking lot in Austin, Texas, on Monday.

Ethan Nieneker, 32, is being held at the Travis County Jail, charged with capital murder by terror threat, capital murder of a person under 10 years old and felony first-degree murder, according to online jail records.

The suspect has “a mental health history” and prior criminal offenses, Austin Police Chief Lisa Davis said in a news conference Monday.

It is unclear if Nieneker has made a court appearance or obtained an attorney. The Austin Police Department said it will hold a news conference Tuesday at 2 p.m. CT.

A motive has not been determined and it’s not clear what led to Monday’s gunfire.

The shooting is one in a spate of deadly gun violence in the US. It follows killings in recent weeks at places normally considered safe – a Montana bar, the offices of the US Centers for Disease Control and Prevention in Atlanta and an office building in New York City.

In Austin, police were called at 2:15 p.m. and arrived at the Target parking lot where they found three people shot, Davis said. The gunfire erupted during a busy time of year for retailers, with back-to-school shopping underway.

Two people died on scene and a third person was declared dead at the hospital, Austin-Travis County Emergency Medical Services Chief Robert Luckritz said. A fourth person was treated for non-gunshot related injuries, he added.

One of the victims who died at the scene was a child, while the other two victims were adults, said Captain Shannon Koesterer, said a public information officer for the Austin-Travis County Emergency Medical Services.

The suspect fled the Target parking lot by stealing a car at the scene, then crashed it and stole a second car from a Volkswagen dealership, Davis said.

The man was captured about 20 miles away in south Austin after someone called police, Davis said. He was taken into custody after being tased.

“This is a very sad day for Austin. It’s a very sad day for us all and my condolences go out to the families,” Davis said. She did not reveal the identities of the victims.

Austin Mayor Kirk Watson called the shooting “a sickening, cowardly act of gun violence.”

“This is a devastating situation, and my heart is with the victims and their families,” he said in a post on X.

Target said in a statement it is “devastated by the violence” at the Austin store and working with law enforcement on the investigation.

Lonnie Lee, 22, had visited the Target with her sister and was shocked to see the parking lot was cordoned off and filled with police, she told the Associated Press.

“We got really, really lucky,” Lee said. “And some people didn’t.”

At a Jiffy Lube shop that shares its parking lot with the Target, employees locked the doors as soon as they became aware of the shooting. Paul Smith, an employee at the oil-change store, saw people running from their cars in the parking lot in a panic, he told the AP.

“I had just gotten back from the Target like a minute before,” Smith said.

Monday’s shooting comes just over two weeks after an attack in a Walmart parking lot in Traverse City, Michigan, in which 42-year-old Bradford James Gille allegedly stabbed 11 people in what authorities described as “random acts.”

All victims - ages 29 to 84 - were expected to survive and Gille was charged with one count of terrorism and 11 counts of assault with intent to murder.

This story has been updated with additional details.

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