A man suspected of killing 15 people during a shooting in Bondi Beach "conducted firearms training" with his father before the attack on a Jewish event, Australian police have said.

A man accused of killing 15 people at Sydney’s Bondi Beach conducted “firearms training” in an area of New South Wales outside of Sydney with his father and recorded a video about their “justification” for the attack, the Australian Broadcasting Corp. reported Monday, citing police documents. The police statement of facts was made public following Naveed Akram’s video court appearance Monday from a Sydney hospital. The statement alleges the 24-year-old and his father, 50-year-old Sajid Akram, threw four improvised explosive devices toward at crowd involved in a Jewish event at Bondi Beach on Dec. 14, but they didn’t explode, ABC reported.

A man accused of killing 15 people at Sydney’s Bondi Beach reportedly conducted firearms training with his father.

WARNING, GRAPHIC CONTENT: Fox News senior foreign affairs correspondent Greg Palkot reports the latest on the deadly shooting at Bondi Beach. Retired NYPD inspector Paul Mauro weighs in on the investigation into the attack.

More than 1,000 people were celebrating the Jewish festival of Hanukkah on the beach on Sunday evening when two gunmen opened fire from a bridge, killing at least 15 people.