Man accused of slashing Sydney police officer with a knife in attempted murder is found dead in jail - after claiming he was beaten by prison guards over the shocking attack

A man accused of slashing a police officer across the head with a knife has been found dead in his prison cell.

Frederick Fadi Elrezz was arrested on Wednesday, September 2, after he allegedly attacked two officers with a knife and biting a third on York Street in the Sydney CBD.

He was being held at Parklea Correctional Centre after being charged with attempted murder. 

Elrezz was found dead in his cell on at 8.15am on Friday morning. It is understood he had a long battled mental health issues.

He had claimed he was beaten by prison guards over the attack. 

Frederick Fadi Elrezz was arrested on Wednesday after he allegedly attacked two officers with a knife and biting a third on York Street in the Sydney CBD

Frederick Fadi Elrezz was arrested on Wednesday after he allegedly attacked two officers with a knife and biting a third on York Street in the Sydney CBD

A policeman (pictured), 40, was allegedly slashed in the head and shoulder by a Lakemba man, 32, on York Street in the Sydney CBD at 12:20am on Wednesday, September 2

A policeman , 40, was allegedly slashed in the head and shoulder by a Lakemba man, 32, on York Street in the Sydney CBD at 12:20am on Wednesday, September 2

A spokeswoman from MTC Broadspectrum, which runs the prison, said Corrective Services NSW and NSW Police are investigating the death. 

She would not go into further details as all deaths in custody are subject to a coronial inquest. 

The 32-year-old was accused of attacking the three officers after they confronted him after he allegedly harassed a food delivery rider in Sydney's George street.

A male senior constable, 40, was slashed across his head and shoulder while his male acting sergeant, 39, was slashed on the hand. 

A male probationary constable, 20, was bitten on his tricep. 

Elrezz was then disarmed and arrested, before being taken to St Vincent's Hospital for assessment. 

The injured officers were also taken to St Vincent¿s Hospital, where the 40-year-old officer (pictured)underwent treatment for lacerations on the left side of his head and another on his upper arm and shoulder area

The injured officers were also taken to St Vincent's Hospital, where the 40-year-old officer underwent treatment for lacerations on the left side of his head and another on his upper arm and shoulder area

Pictures from after the attack show blood pouring from the senior constable's head, covering most of his face.  

A bite mark and blood can also be seen on the youngest officer's tricep. 

The injured officers were also taken to St Vincent's Hospital, where the 40-year-old officer underwent treatment for lacerations on the left side of his head and another on his upper arm and shoulder.  

Meanwhile, the 39-year-old was treated for a laceration to his finger and a knee injury and the youngest officer was treated for his bite. 

Soon after the attack, Elrezz allegedly told officers: 'I wanted to kill a cop in the name of Allah', The Australian reported.

A male probationary constable (pictured), 20, was bitten on his tricepA bite mark and blood was visible on the wound

A male probationary constable , 20, was bitten on his tricep with a bite mark and blood visible

He also allegedly said 'Allahu Akhbar' during his subsequent interview.

There is nothing in the 32-year-old's history that indicates he supports extremist agendas or that he has been radicalised.

Anti-terror teams were investigating his background to assess any potential links to terror organisations.

Daily Mail Australia has contacted Corrections NSW for further comment.