A bomb threat to the Oshman Family Jewish Community Center in Palo Alto on Monday, part of a rash of similar threats to Jewish centers nationwide, has shaken up the community. State Assemblyman Marc Berman, D-Palo Alto, said in a statement Tuesday he was “saddened and deeply troubled” by the bomb threat, especially as police continue to investigate the vandalism of a dozen buildings and street signs with swastika symbols in Palo Alto and at Stanford University earlier this year.