Children in Teletubbies and pirate costumes traipsed down the streets of Old Irving Park on Sunday afternoon.

But on Saturday, the air was thick with white clouds of tear gas as a chorus of whistles rang out as federal agents took three people — two of them U.S. citizens and one a rapid responder — into unmarked vehicles before “erratically” speeding off, according to at least three residents who witnessed it. A Halloween parade was canceled because of the incident.

It’s the latest Chicago neighborhood where federal agents deployed chemical munitions. Neighborhoods including Lake View , Little Village , East Side , Albany Park , Brighton Park and Logan Square have been the scene of federal activity recently while other neighborhoods have already been targeted as part of “Operation Midway

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