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Originally, 6 children were taken hostage, but four had been released overnight NBC Chicago reported.  One of the children released has a breathing problem.   A SWAT team member rescued him from a porch after gunmen released him, Fox News reported.

The standoff started Tuesday afternoon when police were called to a break-in at a home, the Chicago Tribune reported.

The suspects opened fire on the police as they approached, Harvey spokesman Sean Howard said in the Tribune's article.

The town's mayor said one officer was grazed by a bullet.  A second was wounded in the elbow.

About 100 residents were evacuated, as well as a nearby school.

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A rendering of the columbarium memorial that is estimated to be completed by next summer or fall in the southeast part of Oakland Cemetery, officials said. (Courtesy of Historic Oakland Foundation)

Credit: Historic Oakland Foundation