Documents released Monday outline allegations against Naveed Akram and his father Sajid over the 14 December attack

New details about the police case against the alleged Bondi terrorists have been released, including details of an alleged video manifesto linked to the Islamic State and the undetonated explosives – including a “tennis ball bomb” – found at the scene.

Naveed Akram, 24, faces charges of murdering 15 people and injuring dozens more in the shooting at a Hanukah celebration on 14 December. His 50-year-old father, Sajid Akram, 50, is the second alleged shooter and died at the scene.

The police “fact sheet” – outlining their allegations against Naveed – reveals investigators believe three pipe bombs and a tennis ball bomb were thrown towards the crowd before the pair began shooting. While they did not detonate, police alleged they were “viable improvised explosive devices”.

Police allege in the court document, released Monday, that there is evidence that the pair “meticulously planned this terrorist attack for many months”.