A US federal agent on Saturday shot a motorist who was allegedly armed and blocking law enforcement vehicles in Chicago, as tensions in the Democratic stronghold spike ahead of an expected deployment of troops as part of President Donald Trump's crackdown on illegal immigration.

The Midwestern city is the latest flashpoint in the Trump administration's aggressive mass deportation campaign that has seen heavily militarized raids and protests in cities including Los Angeles, Washington and Portland, Oregon.

The US Department of Homeland Security (DHS) said the shooting took place Saturday morning after agents were "boxed in by 10 cars."

"Agents were unable to move their vehicles and exited the car. One of the drivers who rammed the law enforcement vehicle was armed with a semi-automatic w

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