Leading Jewish groups in the United States are urging all Jewish organisations to ratchet up security measures at public events -- including restrictions on access -- following the deadly mass shooting that targeted a Hanukkah celebration on a popular Australian beach. The groups -- including three which specialise in security issues -- said Jewish public events in the coming days should be open only to people who had been screened after preregistering. Provide details of location, time, and other information only upon confirmed registration, the groups' advisory said. Have access control (locks and entrance procedures) to only allow known, confirmed registrants/attendees into the facility/event. Coinciding with this urgent appeal for increased precautions, some rabbis said their synagogues would proceed with large-scale celebrations, intended to demonstrate resilience. The mass shooting is the latest reminder of the Jewish community's longstanding reality of having to factor securi