Live updates for the Highland Park Parade: The city turns in horror as a 22-year-old is arrested

The mayor of the Chicago suburb, where a gunman killed six people and injured dozens at a July 4 parade Monday, called the shooting “the bloodiest day we’ve ever seen in Highland Park.”

Some central streets remained closed Tuesday due to an FBI investigation, many public events were canceled and crisis counseling was in place at Highland Park High School, Mayor Nancy Rotering said in a statement. Flags at Highland Park will be flown at half-mast, she added.

The mayor said she had messages from her counterparts across the country, including “many who lead communities that have experienced this pain and tragedy.”

Police arrested a “person of interest” Monday night after a gunman sitting on a rooftop fired dozens of shots at parade spectators, adding another name to the list of American cities and towns hit by mass shootings added. Footage showed blood pooling on the sidewalk at the Highland Park parade route, with chairs, toys and blankets strewn nearby after people fled the gunfire.

“Our community, like so many before us, is devastated,” Rotering said, thanking first responders for “their courage and extraordinary effort” and the community members who rushed to help. “It’s impossible to imagine the pain of this type of tragedy until it happens in your backyard,” she said.