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There are those "Days Without Accident" signs at factories and warehouses. If the nation had one of those for mass shootings, it would have read "3 days" yesterday. But now, it would have to change back to zero, after the events in Chicago late last night.
There are currently no suspects in custody, after police say someone used an assault-style rifle with a high-capacity magazine to shoot up a park on the city's South Side.
Thirteen people were hurt, including the youngest victim, a 3-year-old boy.
The shooting prompted Mayor Rahm Emanuel to cancel a trip to Washington, D.C., and stay in Chicago. President Barack Obama's adopted home town has some of the strictest gun control laws in the nation, banning some kinds of semi-automatic rifles, called assault weapons, and high-capacity magazines.
Yet just this week, the FBI released data showing Chicago is the murder capital of the U.S.
CNN national correspondent Deborah Feyerick reports.