It is reported by RIA Novosti with reference to the representative of law enforcement agencies Highland Park.
"The suspect is now described as a white male, approximately 18-20 years old, with long black hair, of a slim build, wearing a white or blue T-shirt," he said at a press conference.
Police said they found the weapon used by the perpetrator, but continue to believe the suspect is "armed and very dangerous."
Earlier it was reported that in the state of Illinois there was a mass shooting during the parade in honor of the US Independence Day.
According to the latest data, as a result of the incident, six people died and 24 were injured.