DNC protests: Fence line breached near United Center after protesters march from Union, Humboldt parks [Video]

CHICAGO — Protesters breached an outer fence line on the north side of the United Center Monday evening on the first day of the Democratic National Convention.

Capitol police wearing gas masks could be seen in the area around 5 p.m.

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More police officers wearing riot gear later approached.

At least four people were taken into custody, as police formed a barricade to block the breached fencing, on the south end of Park 578 in the 1900-block of West Washington Street.

Chicago Police Superintendent Larry Snelling was in the area, overseeing the response.

The inner perimeter was not breached, and there was no threat to anyone inside, the DNC Public Safety Joint Information Center said in a statement.

“The National Special Security Event plan …