Person of interest responsible for deadly parade may have criminal history

(KYMA, KECY/ NBC News) - Senior law enforcement officials are now saying the person of interest in Waukesha who may have a significant criminal history was being questioned overnight.

The suspect driving an SUV plowed through a Christmas parade, killing at least 5 people and hurting more than 40 others.

Investigators say the person behind the wheel may have been involved in an earlier incident involving a knife and was fleeing when the vehicle reached the parade.

Those hit by the SUV were taken to area hospitals and the city of Waukesha said by Twitter that the number of those injured in the tragedy may change throughout the day.