A red SUV was driven through a crowded Christmas parade in Waukesha in the U.S. state of Wisconsin on Sunday, killing five people and injuring more than 40 others, authorities said. 

"At this time, we can confirm that 5 people are deceased and over 40 are injured. However, these numbers may change as we collect additional information. Many people have self-transported to area hospitals," Waukesha city tweeted on early Monday morning.

The suspect's vehicle has been seized and a person of interest in the case is in custody.

The identities of the victims haven't been revealed. The indications are the suspect of the Wisconsin case was fleeing another incident when he drove into the parade route, reported CNN citing multiple law enforcement sources. 

While early in the investigation, there is no known connection to international or domestic terrorism, and it does not appear to be connected to the Kenosha verdict, CNN reported. 

Several video clips posted on social media showed that a red SUV was driven through the crowd at a high speed, and police officers fired multiple shots when the car drove away. 

Police cars and ambulances crowded the street decked out with Christmas lights in the aftermath of the incident. 

(With input from agencies)