U.S. Immigration and Customs Enforcement agents serve an employment audit notice at a 7-Eleven convenience store Wednesday in Los Angeles. (Chris Carlson/AP)

U.S. Immigration and Customs Enforcement agents blitzed dozens of 7-Eleven stores before dawn Wednesday to interview employees and deliver audit notifications, carrying out what the agency said was the largest operation targeting an employer since President Trump took office.

ICE said its agents showed up at 98 stores and made 21 arrests, describing the operation as a warning to other companies who may have unauthorized workers on their payroll.

“Today’s actions send a strong message to U.S. businesses that hire and employ an illegal workforce: ICE will enforce the law, and if you are found to be breaking the law, you will be held accountable,” said Thomas D. Homan, the agency’s top official, in a statement.

Homan characterized the operation as a new front in the Trump administration’s broader immigration crackdown and its effort to increase deportations. ICE agents have made 40 percent more arrests in the past year.

“Businesses that hire illegal workers are a pull factor for illegal immigration and we are working hard to remove this magnet,” Homan’s statement said. “ICE will continue its efforts to protect jobs for American workers by eliminating unfair competitive advantages for companies that exploit illegal immigration.”

The White House has said they are focused on deporting undocumented immigrants who “pose a threat to this country,” but advocates say undocumented immigrants without criminal records are being detained by ICE. (Monica Akhtar/The Washington Post)

ICE said it sent agents Wednesday to deliver audit notifications…