Shocking video captured the moment a man walked into a San Francisco synagogue and fired several blank rounds in front of stunned congregants after reportedly saying, “I’m going to show you something.” The terrifying episode unfolded at the Schneerson Center, a synagogue predominantly attended by Russian-speaking Jews, where the man walked in at about 7:30 p.m. Wednesday. He made some hand gestures in front of a group of people, pulled a gun from his jacket and fired the blanks, the video posted by KRON shows. As an elderly man approached him, the gunman saluted and left the synagogue. Police later...