The state’s top cop issued a warning to California employers Thursday that businesses face legal repercussions, including fines up to $10,000, if they assist federal immigration authorities with a potential widespread immigration crackdown.

“It’s important, given these rumors that are out there, to let people know – more specifically today, employers – that if they voluntarily start giving up information about their employees or access to their employees in ways that contradict our new California laws, they subject themselves to actions by my office,” state Attorney General Xavier Becerra said at a news conference. “We will prosecute those who violate the law.”

Becerra’s warning comes as fears spread of mass workplace raids following reports that immigration agents plan to target Northern California communities for deportations due in part to the state’s “sanctuary” law, which seeks to restrict local law enforcement agencies’ ability to cooperate with immigration authorities.