CLEVELAND, Ohio -- A teen was shot outside Tower City shortly after the end of the Cavs victory parade in downtown Cleveland.

The shooting happened shortly after 5 p.m. near Euclid Avenue and Ontario Street.

Cleveland police said that a 13-year-old girl was shot and that a 15-year-old was taken into custody shortly after the shooting. Police said that two witnesses told investigators that the teen taken into custody was not the shooter.

Police are searching for a second suspect.

The shooting came toward the end of a mostly peaceful day in downtown Cleveland that saw an estimated 1 million people visit to revel in the Cavaliers championship victory.

Lauren Harrison was inside the Euclid Arcade charging her phone when the shooting happened.

"We heard screams, and a couple of people thought maybe the players came through," she said. "People looked nervous, scared. I found my daughter and the cops came running through...people were running up the steps to the [hotel] and tripping over each other."

Tensions rose around Tower City as people leaving the parade were met with hours-long delays on RTA trains. The shooting brought transit out of Tower City to a standstill.

Officials have not discussed a possible motive in the shooting.

A cleveland.com reporter at the federal courthouse said that several traumatized witnesses walked into the courthouse after the shooting.

I'm at the fed. courthouse. Security let people panicked from the shooting in from safety. There are a few dozen people here. #cavsparade — Eric Heisig (@eheisig) June 22, 2016

SWAT officers searched nearby restaurants Harry Buffalo and Hyde Park after several calls reported possible shooters in those buildings. Officials later determined that those claims were unfounded.

Cleveland Police Chief Calvin Williams said the initial report reported that the shooting happened inside the Jack Casino, but police cleared the building. The chief said the casino was expected to reopen later Wednesday evening.

Another cleveland.com reporter who was outside Tower City said that she heard about four gunshots and saw people screaming and running away from the building. Mothers held their children.

Reports of robbery at Harry Buffalo are false. No additional incidents to report. — Cleveland Police (@CLEpolice) June 22, 2016

No one shot in casino. No shooting in casino. — Cleveland Police (@CLEpolice) June 22, 2016

Cleveland Tower City panic 29 Gallery: Cleveland Tower City panic

Cleveland.com reporters Cory Shaffer and Eric Heisig contributed to this story.

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