The gunmen behind the deadly Bondi Beach attack last week threw four undetonated explosives -- including a "tennis ball bomb" -- at the start of the attack that killed 15 people, according to newly released court documents. The statement alleges the 24-year-old Naveed Akram and his father, 50-year-old Sajid Akram, conducted "firearms training" in an area of New South Wales outside of Sydney and recorded a video about their "justification" for the attack, the Australian Broadcasting Corporation (ABC) reported, citing police documents.