Federal immigration agents raided 77 businesses in Northern California this week, demanding proof that their employees are legally allowed to work in the United States, officials said Thursday.

The businesses were given three working days to comply with the order, the federal Immigration and Customs Enforcement agency said.

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It was believed to be the largest such localized sweep of workplaces since President Trump took office. Thomas Homan, the agency’s interim director, has called for a large increase in such raids in recent months.

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Media: Associated Press

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ICE did not identify any of the businesses its agents raided in the Bay Area and Sacramento region Monday through Wednesday. Agents made no immediate arrests, ICE said.

Hamed Aleaziz is a San Francisco Chronicle staff writer. Email: haleaziz@sfchronicle.com Twitter: @haleaziz