Alleged Bondi gunmen threw 'tennis ball bomb', new documents saySuppliedA screenshot from a video found on Naveed Akram's phone shows his father conducting firearms training, police allege The gunmen who allegedly carried out a deadly attack on a Jewish festival at Bondi Beach last week threw four undetonated explosives at the start of the attack, including a "tennis ball bomb", according to newly released documents. Naveed Akram, 24, has been charged with dozens of offences including 15 counts of murder over the attack at a Hanukkah celebration on 14 December. Akram, who was shot by police during the attack, was released from hospital on Monday and transferred to a prison. The second alleged gunman, his father Sajid Akram, was shot dead. The pair recorded a video manifesto in October in which they sit in front of the Islamic State group flag, according to police documents. SuppliedA screenshot from CCTV shows the Akrams carrying 'bulky items' hours before the attacks, police allegeThe Akrams "meticulously planned this terrorist attack for many months", police alleged. Videos found on Naveed's phone showed the pair were motivated by "violent extremist ideology" linked to the Islamic State group. They include one video in which the pair sit in front of an Islamic State flag and detail their motivation for the Bondi attack and condemn "the acts of 'Zionists'", police alleged.