CHICAGO — During Memorial Day weekend, this city reopens its Lake Michigan beaches, regular fireworks displays start at Navy Pier, and the downtown streets and spruced-up Riverwalk are crowded with tourists.

But the holiday weekend is often seen here as the start of heightened violence as well. That has been particularly worrying this year to community leaders and city officials, as they grapple with a rise in gun violence that has traumatized some neighborhoods and left city officials searching for new ways to subdue street crime.

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