Three people were in custody in connection with a shooting at the Raptors' NBA championship parade Monday that left four people injured, Toronto police said in a statement.

Two firearms were recovered, the Toronto police said in a news release that asked for the public's help with the investigation of the incident. The shooting occurred about 3:45 p.m. ET near Nathan Phillips Square, which marked the end of the parade route.

Constable David Hopkinson of the Toronto Police Service confirmed to USA TODAY Sports injuries to two of the victims were “considered serious, but not life-threatening.” Hopkinson did not have information on status of the two others injured.

Hopkinson said that identities of the suspects would not be released until they were charged.

Videos shared on social media show thousands of people running in panic.

From the scene, Bruce Arthur of the Toronto Star tweeted that gunshots were fired.

"One witness said four shots. Crowd ran. There is a victim down being given medical attention, surrounded by a crowd, and police are clearing people from the area. Speeches are still going on," he said.

"Crowd on east side running again. Cops said get down. Oh no," he added.

The ceremony was briefly stopped as Raptors radio play-by-play announcer Matt Devlin informed the crowd that there had been an incident, but urged them to remain calm.

"We're here to celebrate, which we will. But I just want everybody to just take a moment, please stay strong. There is an emergency that is being dealt with," Devlin told the assembled crowd.

After about a two-minute delay, the program continued without interruption until its conclusion.

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This is a developing story. Continue to follow for updates.