Fifteen minutes before he shot dead NSW Police accountant Curtis Cheng, Sydney teenager Farhad Jabar turned to a CCTV camera inside Parramatta Mosque and gave the Islamic State salute.
An image of the 15-year-old holding his index finger in the air, captured on camera near a stairwell in the mosque's main entrance after 4pm on October 2, 2015, was tendered to the Downing Centre Local Court on Monday.
![Picture of Farhad Jabar doing Islamic Salute .](/web/20170502105724im_/http://www.smh.com.au/content/dam/images/g/v/w/k/t/6/image.related.articleLeadwide.620x349.gvwn36.png/1493661809385.jpg)
At 4.30pm that afternoon, Jabar shot dead Mr Cheng, 58, as he exited NSW Police Headquarters to spend the long weekend with his family. Jabar was killed moments later, in a shootout with special constables tasked with guarding the police building.
A bloodied note found on Jabar's body was also tendered in court on Monday. Addressed to the "disbelievers" it states: "your security means nothing to us" and "know your weapons are nothing compared to what we have".
![Farhad Jabar points his gun at a police officer.](/web/20170502105724im_/http://www.smh.com.au/content/dam/images/g/k/0/o/h/d/image.related.articleLeadwide.620x349.gvwn36.png/1493653273821.jpg)
"Soon by the will of God ... your nights will turn into nightmares, your days into hell," the note reads. "By the will of Allah I have come today to put terror into your hearts and soon the majahideen will do the same, by the will of Allah."
The CCTV footage and note were tendered on the first day of a committal hearing for three men - Talal Alameddine, 24, Mustafa Dirani, 23, and Milad Atai, 21 - who are accused of aiding Jabar's plot.
A fourth man, 19-year-old Raban Alou, has also been charged over the plot but is not involved in this committal proceeding.
During Monday's hearing, Crown prosecutor Paul McGuire SC said the bloodstained note found on Jabar was almost identical to a torn-up note found in the bin of the teenager's bedroom that appeared to have been written by his sister.
![Curtis Cheng, who was shot dead outside Parramatta police headquarters, pictured with his son Alpha.](/web/20170502105724im_/http://www.smh.com.au/content/dam/images/g/n/y/a/5/i/image.related.articleLeadwide.620x349.gvwn36.png/1493661810009.jpg)
Jabar's sister allegedly flew to Syria the day before Mr Cheng's murder.
Mr McGuire said after Jabar shot Mr Cheng, the online Islamic State magazine Dabiq referred to the teenager as among the "brave knights" of jihad who had "struck the crusaders of Australia and killed one of their personnel".
![Farhad Jabar.](/web/20170502105724im_/http://www.smh.com.au/content/dam/images/g/k/8/l/i/y/image.related.articleLeadNarrow.300x0.gvwn36.png/1493653273821.jpg)
"The Crown says that reference ... establishes that the Islamic State was taking credit for the act of terror that was committed by [Farhad Jabar]," Mr McGuire said.
Police surveillance material played at the hearing on Monday allegedly shows the terror plotters encountered a major glitch in their plan just hours before Mr Cheng was shot dead.
![Bloody suicide note found on Farhad Jabar CRIME](/web/20170502105724im_/http://www.smh.com.au/content/dam/images/g/v/w/k/l/f/image.related.articleLeadNarrow.300x0.gvwn36.png/1493653273821.jpg)
Aerial police footage allegedly shows Mr Alameddine arranging to supply the murder weapon to fellow accused terror plotter Mr Alou, at a rendezvous at a park at Mays Hill, near Parramatta, about 1.30pm on October 2.
In audio from Alou's car that was played to the court, Alou can be heard saying, "What did you bring?" with Alameddine replying, "Well, I brought the 30 cal, bro.... You wanted the big one."
A displeased-sounding Alou can be heard saying, "Shit bro."
Mr McGuire SC said Alameddine had provided "a firearm that turns out to be not the firearm that's requested, due to the wrong type or the wrong size".
Surveillance footage shows Alameddine and Alou then driving to Merrylands, where Alameddine lived, allegedly to obtain the right weapon.
The men were followed by a second car carrying another accused terror plotter, Dirani.
Mr McGuire said the revolver used to kill Mr Cheng was a .38 calibre Smith & Wesson, which is relatively small and easily concealed compared with the .30 calibre gun that was originally supplied.
with AAP