LOS ANGELES — Law enforcement authorities fired tear gas on a group of protesters gathered in Los Angeles on Sunday, hours after President Donald Trump deployed the National Guard to the city in an effort to quell recent unrest against federal immigration authorities.

The confrontation broke out as hundreds of people protested in front of the Metropolitan Detention Center in downtown Los Angeles, where several of the newly-arrived National Guard troops stood shoulder to shoulder behind plastic riot shields.

Video showed uniformed officers shooting off the smoke-filled canisters as they advanced into the street, causing protesters to retreat. It was not immediately clear what prompted the use of chemical irritants or which law enforcement agency fired them.

Around 300 National Guard t

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