SAN FRANCISCO (CBS SF) — San Francisco Mayor Ed Lee said he was “shocked’ by news of the arrest of State Sen. Leland Yee Wednesday.

Lee said he was briefed by San Francisco Police Chief Greg Suhr on Wednesday morning’s raids in different parts of San Francisco, San Mateo County, and the Sacramento offices of the Democratic state senator.

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Lee, speaking with KPIX 5, said for security reasons, many of the details are still unknown in the ongoing case.

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“The FBI is the lead agency and a number of warrants have been issued throughout Northern California. They’re doing their due diligence and their work, in people that are violating parole, weapons, or gang-related affiliations,” Lee said. “Or even murders or convicts escaping the law. That’s as much detail as I know. I’m not privileged to have any names given to me at all, probably for my safety as well as everyone else.”

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When asked about reports that Yee has been detained as part of the raids, Lee said “That’s shocking news to me … It’s many years of public service so, I don’t know what’s occurred there … I hope for the best.”