A Holocaust survivor, a 10-year-old and a Chabad rabbi were among the 15 people killed when two gunmen opened fire on a Hanukkah event at Australia's Bondi Beach on Sunday. Hundreds of people had gathered to mark the first day of the Jewish festival before the attackers struck at the event in Sydney.

Police and local media reports said the shooting began while some people were attending a Hanukkah party on the beach. At least 40 people were hospitalized.

Ahmed al Ahmed, the Syrian-Australian father who wrestled a shotgun from one of the gunmen attacking a Jewish gathering, is facing a long road to recovery.

Police said around 1,000 people had attended the Jewish celebration, which was held in a small park off the beach.

Two cities, on opposite sides of the world, are united in mourning after deadly mass shootings over the weekend. In both cases, the attacks have left communities shattered while renewing contentious debates over gun control . Here’s what else you need to know to get up to speed and on with your day.

A bystander, identified by 7NEWS Australia as Ahmed al Ahmed, seen disarming a gunman at Sydney's Bondi Beach during a Hanukkah event is being heralded as a hero.

Former New England Patriots star Julian Edelman spoke out about the Brown University shooting and the Australian terror attack in a post on Sunday.