OAK BROOK, Ill. (NewsNation Now) — A suburban Chicago mall reopened Friday as police search for a third suspect involved in a shooting that injured four people.

The shooting happened Thursday evening at Oakbrook Center mall as Christmas shoppers filled stores.

“I was by Nordstrom, and then all of a sudden people just started screaming and yelling and you just heard boom boom boom, you know, everywhere,” one witness said.

Authorities believe there was a shootout between two individuals, with one suspect injured and arrested. It happened outside of Nordstrom’s near a corridor by Ann Taylor.

Police are currently looking for a man who is in his 20s and was wearing a “blue puffy coat.”

A third person, who was not a shooter, was also taken into custody.

Three other people who were shot may have been bystanders hit by ricocheting bullets. All victims are being treated for non-life-threatening injuries, according to police.

Another witness told NewsNation Prime she was in a parking garage with her 5-year-old son and 15-year-old daughter when they saw people running. They told the family to take cover in their car.

“My daughter was, like, ‘Oh my God, mom, that man has a gun,’” the witness, whose first name is Jamara, said on “Prime.” “And I started screaming.”

Her daughter witnessed police arrest one of the suspects.

“People were running, they were panicking, they were crying,” Jamara said. “It was extremely scary.”

SWAT team members went from store to store Thursday, looking for the potential suspect and evacuating shoppers.

“We all were pretty shaken up, but we’re doing good now that we’re not, you know, at the mall anymore,” Jamara said. “It was something that we never would expect to see, you know, at Oakbrook Mall. It literally caught us off guard.”

The Associated Press and NewsNation affiliate WGN contributed to this report.