6 killed in shooting during U.S. July 4 parade.
Person of interest identified
A rooftop shooter opened fire on a Fourth of July parade
In the upscale Chicago neighborhood of Highland Park
Killing six people
Injuring at least 24
Officials suspect the gunman is a Caucasian male
The shooting comes after several incidents of mass violence in the U.S
has reignited the gun control debate.
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