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A new picture issued by police shows Sajid Akram firing a shotgun during training for the Bondi Beach attack(Image: NSW Courts/AFP via Getty Images)

A man who killed 15 people in the horrific Bondi Beach attack ‘threw explosives’ that did not work and had taken part in firearms training with his dad just days before, police say.

Naveed Akram, 24, underwent training in an area of New South Wales state outside of Sydney with his fellow gunman and father Sajid Akram, according to the new documents from police. The 50-year-old was shot dead while exchanging gunfire with police during the terror attack at a Jewish festival on December 14.

On the day, the pair allegedly threw homemade bombs and improvised explosive devices (IEDs) at the crowd of people at the gathering near the beach in Sydney, but these did not detonate.

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Naveed Akram, 24, is said to have thrown explosives at passersby during the Sydney terror attack

The men also recorded a video explaining their motivations for the attack, according to a police statement of facts that was made public following Naveed Akram’s video court appearance today from a Sydney hospital where he has been treated for an abdomen injury.

New South Wales state government confirmed Naveed Akram was transferred Monday from a hospital to a prison, though neither facility was identified by authorities.

The statement alleges the 24-year-old and his father began their attack by throwing four improvised explosive devices toward at crowd celebrating an annual Jewish event at Bondi Beach, but the devices failed to explode.

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The training location is believed to be in New South Wales.(Image: NSW Courts/AFP via Getty Images)

Police described the devices as three aluminium pipe bombs and a tennis ball bomb containing an explosive, black powder and steel ball bearings. None detonated, but police described them as “viable” IEDs.

Authorities have charged Akram with 59 offences including 15 counts of murder, 40 counts of causing harm with intent to murder in relation to the wounded survivors and one of committing a terrorist act.

The antisemitic attack at the start of the eight-day Hanukkah celebration was Australia’s worst mass shooting since a lone gunman killed 35 people in Tasmania state in 1996.

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Sajid Akram, 50, was shot dead by police at the scene

The New South Wales government introduced draft laws to Parliament on Monday that Premier Chris Minns said would become the toughest in Australia, including making Australian citizenship a condition of qualifying for a firearms license.

Sajid Akram legally owned six rifles and shotguns, and anew legal limit for recreational shooters would be a maximum of four guns.

Police said a video found on Naveed Akram’s phone shows him with his father “recite their political and religious views and appear to summarise their justification for the Bondi terrorist attack.”

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CCTV images showed Sajid and Naveed Akram leaving a property on the day of the attack(Image: NSW Courts/AFP via Getty Images)

The men are seen in the video “condemning the acts of Zionists” while they also “adhere to a religiously motivated ideology linked to Islamic State,” police said.

Video shot in October show them “firing shotguns and moving in a tactical manner” on grassland surrounded trees, police said.

“There is evidence that the Accused and his father meticulously planned this terrorist attack for many months,” police allege.