No verdicts at NSW terror stabbing trial

A Sydney pharmacy student who repeatedly stabbed a passer-by in an alleged terror attack will face a retrial after a jury failed to agree on whether he was suffering from a mental illness at the time.

Ihsas Khan, 25, pleaded not guilty on the grounds of mental illness to committing a terrorist act and to wounding Wayne Greenhalgh with intent to murder him at Minto in September 2016.

Khan, who the Crown alleged was a "self-radicalised extremist Muslim" and Islamic State supporter, has not denied attacking Mr Greenhalgh but told a psychiatrist that a jinn, or supernatural being, instructed him to kill someone.

A psychiatrist called by the defence testified it was reasonable to conclude Khan was suffering symptoms consistent with a diagnosis of schizophrenia during the period surrounding the stabbing.

But a crown psychiatrist said Khan was suffering from obsessive compulsion disorder at the time and this had no connection to the events on September 10.

The NSW Supreme Court jurors retired on Wednesday but on Monday said they were unable to reach unanimous verdicts.

Justice Geoffrey Bellew listed the case for mention on Tuesday.