Farhad Jabar Khalil Mohammad
The 15 year old listened to a lecture by an extremist group at the Parramatta Mosque just hours before he shot and killed Curtis Cheng with one shot to the back of the head.
Curtis Cheng (left) and family
Farhad Jabar Khalil Mohammad heard a talk by Islamist group Hizb ut-Tahrir, changed into a black robe and set off with a gun to police headquarters, a 15 minute walk away from the mosque.
He dumped his backpack at the nearby high school he attended, closed for the holidays, and inside, police found material linked to a Sydney Islamic bookstore.
After the teenager shot Mr Cheng, he danced for joy, shouted Allah, Allah, and continued firing at police until he was killed in a shootout with three constables.
The schoolboy regularly skipped class to pray at the mosque and police have seized recordings of the imam's sermons on Friday. A senior Hizb ut-Tahrir figure is believed to have given a lecture on the day of the shooting.
Hizb ut-Tahrir made headlines last year when four Australian children, one only 6 years old, were seen on video shouting "You're never too young to be a soldier for Khalifa" and chanting "O Bahar, we want your head."
The extremist group rejects democracy, secularism and all Western models of state.
Neil El-Kadomi, a senior figure at Parramatta mosque said Farhad had occasionally visited the building but he did no know him by name. "Because he was very quiet, nobody noticed him" he said. "He's not known in the mosque. He came to the mosque to heal himself before he did the crime, which is wrong."
Mr El-Kadomi said the mosque had nothing to do with the shooting and did not condone it.