More Bondi massacre survivors seek anonymity

More survivors of the Bondi Beach massacre will seek to protect their identities, joining victims who were earlier granted anonymity by a court.

In December, a court suppression order gave those who survived the mass shooting the ability to choose if or when they spoke publicly to the media about the tragedy.

This prohibition on publishing the victims' names or identities without their prior consent was extended at Sydney's Downing Centre Local Court on Wednesday.

More individuals will apply to add their names to the gag order at an upcoming hearing on May 6, the crown prosecutor said.

Fifteen people were killed, including a 10-year-old girl, when Naveed Akram and his father, 50-year-old Sajid Akram, opened fire during Hanukkah celebrations at Bondi Beach on December 14.

The elder Akram was shot dead by police, while his son was arrested, hit with a slew of charges and placed behind bars at Goulburn's supermax prison.

Akram himself did not appear in court on Wednesday.

The 24-year-old's matter will return to court on June 10 to allow police more time to compile the voluminous brief of evidence.

He failed last Thursday to obtain a separate court-imposed gag order preventing publication of the names and address of his mother and siblings.

The court heard his family had been subjected to death threats, harassment and intimidation in the months after his arrest.

Akram has not yet been required to plead to dozens of charges, including terrorism offences, 15 counts of murder and 40 counts of attempted murder.

The father and son's alleged terror attack was Australia's deadliest mass shooting since 1996's Port Arthur massacre.

The men allegedly tossed three pipe bombs filled with steel ball bearings and a tennis ball bomb into the Hannukah celebration at Archer Park before opening fire.

None of the bombs detonated.

A box-like bomb was also allegedly found in the boot of their car while two hand-painted ISIS flags were also in the vehicle.