Residents were outraged after dozens of federal agents marched through MacArthur Park, in one of the city’s most immigrant-heavy neighborhoods. Homeland Security officials said it was an immigration enforcement operation.

Federal immigration enforcement agents swept through MacArthur Park in the Westlake District of Los Angeles on Monday morning, prompting a surprise appearance by the mayor.

U.S. military troops and federal immigration officers have made a brief but mighty show of force at MacArthur Park in Los Angeles.