Two gunmen who killed at least 15 people at a Jewish celebration at Sydney’s Bondi Beach in Australia were a father and son, police said on Monday.

Two gunmen opened fire during a Hanukkah celebration on Sydney’s Bondi beach, killing 15 people, including a child, officials said Monday, in what Prime Minister Anthony Albanese called an act of antisemitic terrorism

A father and son, identified as Sajid and Naveed Akram, carried out a deadly mass shooting at Sydney’s Bondi Beach during a Jewish festival, killing 16, including gunman. Authorities declared the incident a terrorist act, with IS flags found and one attacker previously known to intelligence agencies.