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.

The 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.

CCTV recorded at Bondi beach two days ahead of the attack also showed the Akrams driving to the area and carrying out reconnaissance. Police said the items recovered included three firearms, homemade improvised explosive devices including the 'tennis ball bomb', and two Islamic State flags. They later drove to Bondi where they parked and placed the flags on the inside of the front and rear windows, police alleged.

After removing the firearms and homemade bombs from the car, they walked towards the footbridge from where they carried out their attack. Although many attacks did not explode, police assessed them as 'viable'.

Naveed Akram, who was shot in the abdomen and critically injured by police, did not appear at Monday's court appearance.