Scenes from the tragedy in Waukesha Sunday
Scenes from the aftermath of the attack on the Christmas parade in Waukesha. More than 20 people were injured, some fatally, when an SUV plowed into the parade in the Milwaukee suburb Sunday evening.

Toppled chairs line West Main Street in downtown Waukesha after an SUV drove into Christmas parade-goers, killing multiple people and injuring more than 20, including a dozen children.

A police officer patrols West Main Street in downtown Waukesha after an SUV drove into Christmas parade-goers Sunday.

A broken children’s stroller lies in West Main Street in downtown Waukesha after an SUV drove into Christmas parade-goers Sunday.

Waukesha Police Chief Daniel Thompson tells members of the media that a "person of interest" was taken into custody after an SUV drove into people during a Christmas parade Sunday. He said it was unclear whether the act of violence was motivated by terrorism.

Waukesha Mayor Shawn Reilly and Police Chief Daniel Thompson address the media Sunday evening.

Toppled chairs line West Main Street in downtown Waukesha after an SUV drove into Christmas parade-goers Sunday.