THE sister of accused terrorist Milad Atai has been charged with offensive behaviour after she spat on a female photographer outside a Sydney court in May.

Police served a future court attendance notice to the Guildford home of Mehri Atai, 29, in the early hours of Wednesday morning.

Her brother Milad Atai, 21, is accused of planning the terrorist attack in which police employee Curtis Cheng was killed outside NSW Police Parramatta headquarters in October 2015.

media_camera Mehri Atai (centre) and other supporters of her brother Milad, who is accused of plotting the terrorist attack in which police employee Curtis Cheng was murdered.

It is alleged Mehri Atai yelled at a Daily Telegraph photographer outside the Sydney Downing Centre before spitting in her direction on the corner of Elizabeth and Liverpool Sts on May 19.

She is expected to face the Downing Centre Local Court on Wednesday, July 19.

The photographer was also allegedly hit on the back of the head and her hand was bruised in a scuffle with supporters of Milad Atai, who had come out of court after a magistrate had refused him bail.

media_camera Milad Atai, who is accused of planning the terrorist attack by teenager Farhad Jabar in which police employee Curtis Cheng was killed.

The alleged victim told police she was called “a f***ing slut” and told her to “become a prostitute and get a real job”.

Police are appealing for anyone who witnessed the alleged assault to contact Crime Stoppers.

Earlier that day Milad Atai and co-accused Mustafa Dirani had applied for bail, with their lawyers arguing there were “exceptional circumstances” because they had not been given proper access to their lawyer or the brief of evidence against them.

Magistrate Clare Farnan’s refused their bail application shortly after Raban Alou, 19, pleaded guilty to committing a terrorist act after he supplied a gun to schoolboy Farhad Jabar, 15, which he used to murder Mr Cheng.

Alou now faces the possibility of life in prison and his three co-accused have been committed to stand trial.

Alou, Atai, Alameddine and Dirani will be arraigned in the Supreme Court on July 7.