Six people are dead and 24 have been sent to hospital after a shooting at a Fourth of July parade in the Chicago-area suburb of Highland Park, Illinois, police confirmed on Monday.

At a press conference, law enforcement officials told media that the shooting appears “completely random” and it appears the shooter was on a roof with a rifle, which an official from the Lake County Sheriff’s Department says has been recovered.

Police said the shooter is a white male, around 18-20 years old with long black hair and a small build, and is considered “armed and dangerous.”

Police warned residents to “shelter in place” as the hunt continues for the shooter, while a perimeter has been secured in the city’s downtown area.