Oakland Mayor Jean Quan apologized after she promoted a lock-picking class in her office newsletter, The Associated Press reported.
The Oakland Tribune reported the class is intended for those who lose their keys, but with a 40 percent spike in burglaries last year, the reaction to the listing wasn't a positive one.
"Of all the incredibly unbelievable things I've witnessed in my life, this tops the list," resident Julie Mills said in an online letter to the mayor.
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On Wednesday, Quan said more attention needs to be paid to what goes into the 20-page publication.
"I am ultimately responsible for what goes out," the mayor said in a statement. "And I and our editor will do a better job reviewing these listings in the future before sending them."