CHICAGO (WLS) -- Concerns are growing over federal operations in the Chicago area.

The U.S. Department of Homeland Security responded Sunday to an incident that appeared to involve federal agents deploying tear gas on Chicago's Northwest Side.

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On Saturday, federal agents deployed what appeared to be tear gas in Chicago's Old Irving Park neighborhood.

DHS is once again defending their agents actions, saying they were acting in self-defense when they lobbed tear gas onto a residential street in Old Irving Park on Saturday. The man they were after, they say, had previously been arrested for assault.

Cell phone video showed the moment Border Patrol agents deployed tear gas on North Kildare Avenue near Waveland. It happened after r

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