Bondi gunmen threw explosives at the start of the attack and practiced shooting weeks before, police allege.

The alleged gunmen in the Bondi Beach attack threw explosives at the start of the deadly incident and had practiced shooting weeks earlier while planning the attack, according to new court documents.

Fifteen people were killed and dozens more injured when two gunmen opened fire on a Hanukkah celebration on December 14. The explosives, including a “tennis ball bomb,” did not detonate, according to the documents.

Naveed Akram, 24, has been charged with 59 offences, including 15 counts of murder and one count of terrorism. A second gunman, his father, Sajid Akram, was shot dead by police at the scene.

According to the documents, the pair “meticulously” planned the attack for several months and, two days before the shooting, visited Bondi to conduct reconnaissance.

Last week, a temporary suppression order was issued following the publication of the police fact sheet to protect survivors’ identities. It was revoked on Monday and the documents were released with some redactions.

Included are details of several videos that track the movements of the alleged gunmen in the months, days and hours leading up to the attack.

A video, taken with one of their mobile phones in October, is described as showing the men sitting in front of an image of an Islamic State (IS) group flag.

They are heard making statements about the motives for the attack and condemning “the acts of the ‘Zionists’,” police say.

It is also recorded that Naveed Akram appears to recite, in Arabic, a passage from the Quran.

Police said separate footage from October shows the father and son “undergoing firearms training at a rural location”, believed to be in New South Wales. They are seen “firing shotguns and moving tactically,” officials added.

CCTV footage from the night of December 12 is said to show two men “believed to be the accused and his father” in their car next to Bondi Beach.

“The accused and his father, S Akram, are seen exiting the vehicle and walking along the walkway, which is the same place where they went two days later and shot at the public,” the document states.

“Police allege this is evidence of recognition and planning of a terrorist act.”

At around 02:00 (15:00 GMT) on the day of the attack, two men were captured on CCTV leaving a rented home in the Sydney suburb of Campsie, “carrying long, bulky objects wrapped in blankets”, which they placed in a car.

The documents note that these include two single-barrel shotguns, a Beretta rifle, four improvised explosive devices (IEDs) and two ISIS flags.

Police say that shortly after 17:00 (08:00 GMT), the men were seen leaving the apartment. Separate images capture them arriving at Bondi at 18:50 (09:50 GMT), where they parked and placed the flags on the inside of the front and rear windows.

They are then seen removing the firearms and improvised explosive devices from the car, before walking onto a walkway, according to the documents.

It was from this location that police believe the explosives (three homemade bombs and a “tennis ball bomb”) were thrown into the crowd, although none exploded.

A short time later, they used the firearms to shoot into the crowd, police say. Fourteen people died at the scene. Another later died from his injuries in hospital.

Sajid Akram was shot dead during an exchange of fire with New South Wales Police officers.

Naveed Akram was seriously injured by police firing. He was released from the hospital on Monday and transferred to a prison.

The attack on Bondi Beach sparked calls for tighter restrictions on gun ownership and more efforts to protect the Jewish community from growing anti-Semitism.

On Monday, the state of New South Wales convened its parliament to debate a series of new gun and protest laws proposed in the wake of the shooting.

Some civil rights groups and gun advocates have expressed concern that the laws place undue restrictions on firearms and protests.

NSW Premier Chris Minns said some may feel the changes had “gone too far” but were necessary to keep the community safe.