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An altercation that left four people dead and another 14 injured in a Waukesha, Wisconsin, parade is over, but authorities don’t yet know what started it, Waukesha Police Chief Russell Jack says.
A criminal investigation is underway, Jack said at a news conference on Thursday morning.
Two people involved in the melee are in custody, Waukesha County District Attorney Brad Schimel said during a separate press conference. The person of interest is reportedly a man in his 30s, which Schimel added is “not unexpected.”
But police are still investigating “the totality of the circumstances that led to the events at the top of this hour,” Jack said. It’s not yet clear what sparked the violence or if the four people killed had anything to do with it, he said. Police are trying to connect the dead with their loved ones.
They also cannot confirm a specific incident, Jack said.
Related: Rodeo Parade Brawl Leaves 4 Dead in Waukesha
Officials previously confirmed the four were shot. The autopsy results are still pending.
“We don’t know yet if those deaths were unrelated,” Waukesha County Sheriff’s Maj. Tom Lorenz said at the news conference earlier. “We’re waiting on the autopsies.”
Jack previously said police originally thought the shooting to be drug-related, but later said that is not the case.
Sections of 24th Street were closed as the procession headed from a local high school to the rodeo arena, according to police.
A man was among the 14 people who were injured, Jack said. Those injured will be treated for their injuries.
The game — billed as Waukesha’s 12th annual Rodeo Parade — had about 3,000 participants, said Brian Slattery, president of the Waukesha Rodeo Association.
Some barbecuers were also involved in the procession and it was unclear how many people started the altercation, Jack said.
Related: Gunman Spotted After Rodeo Parade; Multiple Victims Dead in Milwaukee
Madison Police Chief Mike Koval told reporters the three of his officers assigned to Rodeo and the violence appeared to be related to the activity there, but did not elaborate.
This is a developing story. Please stay with NBC News for updates.