Darrell Brooks, the man who allegedly killed six people after driving into a crowd at a Wisconsin Christmas parade, had "no emotion on his face" at the time of the incident, according to police.

In the afternoon of Sunday, November 21, a red SUV suddenly plowed into dozens of people at a Christmas parade in Waukesha, Wisconsin, killing six and injuring at least 62.

The six victims who were killed in the tragic event have been identified as Wilhelm Hospel, 81, Virginia Sorenson, 79, LeAnna Owen, 71, Tamara Durand, 52, and Jane Kulich, 52, and Jackson Sparks, 8.

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Brooks, 39, is the suspected driver of the vehicle and was taken into police custody after allegedly plowing into the crowd. Earlier this week, he was charged with five counts of intentional homicide. He is being held without bond.

According to a criminal complaint released on Tuesday, the suspect appeared emotionless as he mowed down the crowd.

The document contained the accounts of three police officers who were stationed nearby on the day of the rampage, Insider reports.

Officer Butryn had been assisting with crowd control near East Main Street when he was informed over radio that a vehicle was coming down the parade route, according to the complaint.

Butryn went onto East Main Street moments before the SUV turned into it, and, at that time, drove at approximately 25 miles an hour, the complaint said.

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According to the document, Butryn can be heard in a recording of the incident saying: "Stop, stop the vehicle."

"Officer Butryn observed the driver looking straight ahead, directly at him, and it appeared he had no emotion on his face," the complaint said. The driver continued to drive straight past him and towards the parade as he honked the horn, the officer said.

He then recalled how the car suddenly sped up and accelerated towards the crowd.

Butryn also speculated that the car's sudden acceleration was part of "an intentional act to strike and hurt as many people as possible," the complaint said.

Detective Trussoni, whose account of the deadly event was also included in the complaint, spoke to a witness who also thought that it was "a direct intent to hit as many parade participants."

Featured image credit: ZUMA Press, Inc. / Alamy

Darrell Brooks had 'no emotion on his face' as he drove into Wisconsin Christmas parade, police say