By Renju Jose

SYDNEY, Dec 19 (Reuters) - Australia's Jewish community gathered at Sydney's Bondi Beach on Friday ​for prayers, while hundreds of swimmers and surfers ​paddled out into the water to honour the 15 victims killed after alleged father-and-son gunmen opened fire at ⁠people celebrating Hanukkah.

Authorities have said Sunday's shooting, Australia's deadliest in almost 30 years, appears to have been inspired by the Islamic State, and police have ramped up patrols and policing in ​an effort to prevent further violence.

Late on Thursday, police said they had intercepted ‍two cars and detained seven men in ​Sydney's southwest after receiving information that "a violent act was possibly being planned."

Australian police said the men, who were........

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