A former Los Angeles deputy mayor reported to city officials last year that a stranger called and made a bomb threat over city support for Israel, warning an explosive was inside city hall, federal prosecutors said.But Brian K. Williams, the then-deputy mayor of public safety for Los Angeles, called the threat, which was fake, “after he became overwhelmed with stress and anxiety and desperate to get out of an ongoing meeting,” prosecutors wrote in a sentencing memorandum for Williams.Williams,