New Delhi, Dec. 15 -- The two gunmen who opened fire on a Jewish gathering in Sydney's Bondi Beach on Sunday are reportedly a father-son duo. The mass shooting, declared a terrorist attack by Australian authorities, killed 16, including one of the two gunmen, and 15 civilians.

The deadly attack unfolded on Sunday afternoon, with hundreds of people gathered at the popular Bondi Beach to attend the Chanukah by the Sea event, marking the first day of Jewish festival of Hanukkah.

ABC, which first reported on the relationship between the two gunmen, cited law enforcement sources.

Some more details about the two shooters were shared on Monday morning (local time) by New South Wales Premier Chris Minn and Police Commission Mal Lanyon, who als...