ANTIOCH, CA - Nine current and former police officers in the East Bay face federal charges after a raid Thursday by the Federal Bureau of Investigations.

The FBI's roundup of officers from the Antioch and Pittsburg police departments come after an 18-month investigation into an alleged criminal network.

"Today is a dark day in our city's history, as people trusted to uphold the law, allegedly breached that trust and were arrested by the FBI. As our city absorbs this tragic news, we must come together as one," Antioch Mayor Lamar Thorpe said in a statement. "Today's actions are the beginning of the end of a long and arduous process."

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