SYDNEY, Dec 20 - Around 1,000 surf lifesavers returned to duty at Sydney's Bondi Beach on Saturday, restarting regular patrols six days after two gunmen killed 15 people and wounded dozens more at a seaside celebration of Hanukkah, the Jewish festival of lights.

The mass shooting, Australia's worst in nearly 30 years, is being investigated as an act of terrorism targeting the Jewish community, while authorities have ramped up patrols and policing across the country to prevent further violence.