5 shot, 3 fatally at "WestFest" carnival in Salt Lake City suburb. One of those killed was an infant, police say.

5 shot, 3 fatally at

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Five people were shot — three of them fatally, including an infant — at an annual carnival outside Salt Lake City Sunday night, authorities said.

West Valley City, Utah, police said officers at the WestFest noticed two groups of people having a "verbal altercation" and, as they moved in to break it up, "a 16-year-old male from one of the groups pulled out a gun and fired."

An 18-year-old male from one of the groups was killed, along with a 41-year-old female bystander and an 8-month-old infant, police said. 

In addition, police reported, a 17-year-old female and 15-year-old male were hit in the arm. It wasn't clear whether they were connected to the groups involved.

The 16-year-old male suspect is in custody and was taken to the police station for questioning.

A pregnant woman was also injured while trying to climb a fence to flee the scene, .

The station quotes West Valley City police spokesperson Roxeanne Vainuku as saying it's difficult for the community to experience a tragedy during an event meant to celebrate West Valley City.

"It's heartbreaking, I think for all of us, to see something like this happen at something that is just a real treasure, something that we really enjoy in our community," she said.