It's the same school that was attended by the 15-year-old who shot a man dead at Parramatta's police headquarters last week.
Students from Arthur Philip High School in Parramatta have returned to school, sombre over the news that a fellow pupil had taken deadly actions linked to terrorism.
They say they were shocked and saddened to hear about 15 year old Farhad Khalil Mohammad Jabar's attack.
"I just couldn't believe it, that somebody would actually resort to doing it."
"I'm feeling pretty scared about this because the people that he had been talking to, anyone could really do that."
"I'm certainly frightened." (Why's that?) "It just doesn't feel right, you know?"
"He seemed like a nice genuine guy, I just didn't think he would do something like this."
Little did they know that another student from the school had just been arrested.
At around 8.30 in the morning, police approached a teenage boy about alleged posts on social media which appeared to celebrate the shooting dead of New South Wales police employee Curtis Cheng.
During the interaction, police allege the teenager threatened and intimidated officers.
He was then arrested.
Questions have been raised about the circumstances of the arrest.
Civil liberties lawyer Stephen Blanks says the actions were not appropriate and could be damaging to community relations.
"For all that's been said over the last few days about a new approach by the authorities towards the Muslim community, this incident shows that there is still some way to go before that community, indeed the whole community, is treated by police with the respect that the community is due."
Mr Blanks says it will be interesting to see what is the boy's version of the arrest.
"Police know that they don't have the right to access schools without going through the Department of Education processes, the principal has to be notified and has to approve police being on school premises, parents have to be notified and given an opportunity to attend."
The student is being questioned at the State Crime Command in Parramatta, where the fatal shooting took place on Friday.
Police staff have returned from the long weekend break.
Many entering the New South Wales police headquarters looked visibly shaken by the murder of Curtis Cheng, who had worked there for 17 years.
Federal Minister for Multicultural Affairs Concetta Fierravanti Wells says it's important to rally together during these difficult times.
She says some people might question Australia's diversity following such incidents.
Ms Fierravanti Wells believes it is important to work together to help vulnerable young people from becoming prey to radical groups.
"What we are seeing here is that young people who are disengaged, who are at the margins, are being preyed upon. We cannot be in the homes, we cannot be in the schools, government cannot do this alone. They have to do this in partnership with those communities."
The Prime Minister is calling on Muslim leaders to speak up against violent extremism.
Malcolm Turnbull says while community leaders like Jamal Rifi have been vocal in condemning the shooting, others should too.
"The Muslim community is appalled, horrified by this event. Yes they should speak up, but it's more important from a practical point of view that there is leadership in the Muslim community which continues to demonstrate that this type of violent extremism is not consistent with Islam."
There are reports the killer was communicating online with a British man associated with terror group IS.
A specialist in counter terrorism through social media, Dr Anne Aly, says government should also reach out to younger Muslim leaders for help.
"Often by the time they are radicalised, on the road to radicalisation or fully radicalised towards violent extremism, they've completely isolated themselves from the community, they've completely isolated themselves from those figures."
The police investigation into Farhad Khalil Mohammad Jabar's background continues as police try to find out what motivated the young man to take such deadly action.
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