Australian Federal Police (AFP) officers use a dog to inspect equipment
Australian Federal Police (AFP) officers use a dog to inspect equipment belonging to members of the media during the G20 Finance Ministers and Central Bank Governors Meeting in the northern Australian city of Cairns September 20, 2014. As the Group of 20 leading economies meet to change no less than the "destiny" of the global economy, members remain divided on how to get there with Germany pushing back at U.S. calls for more government stimulus. Opening the meeting of finance ministers and central bankers, Australian Treasurer Joe Hockey outlined an ambitious agenda of boosting world growth, fireproofing the global banking system and closing tax loopholes for giant multi-nationals. Reuters/Lincoln Feast

A 14-year-old boy was arrested after he had allegedly screamed death threats at Christians in Sydney.

This was the second occasion when a teenager was arrested in connection with the terror-related charges in Australia. The teenager sat beside the driver of a red hatchback when the car was driving past a school in Sydney's west. He allegedly started yelling abuse on Sept 16. The incident took place outside the Maronite College of the Holy Family in Harris Park. According to onlookers, the boy threatened to "kill the Christians" and their children. He also had an Islamic State flag hanging over the car window, the NZ Herald reported.

Police earlier said that an 18-year-old boy had been arrested. The teenager was charged with offensive behaviour and threatening a school staff member. He was later granted conditional bail as he was a juvenile when the incident took place. He is scheduled to appear in a children's court on Oct 20. The 14-year-old boy is also supposed to appear in a children's court. He, facing similar charges, will appear on Oct 13.

Victoria Police Chief Commissioner Ken Lay, in the meantime, asked his officers to be careful. Lay's instruction came after a terror suspect had been killed in Melbourne. The suspect allegedly stabbed two officers in an unprovoked attack." The 18-year-old Numan Haider was asked to report to the Endeavour Hills police station for interrogation. However, the teenager took out a knife and stabbed the head, stomach and neck of the AFP officer who was taken to The Alfred Hospital. Haider slashed the wrists of the Victoria Police officer as well. The young man was shot by one of the officers in "self-defence." He passed away soon after.

Lay wrote to the police officers of the state. He asked them to remain vigilant and exercise great caution. "This has been a confronting reminder to all police members about the stark realities and dangers that can present themselves at a moment's notice," Lay said. According to Lay, Anti-terrorism officers were aware of Haider for around three months. Haider was seen in an image on Facebook, where he was holding an Islamic flag. He also engaged in abusive language for ASIO and the AFP representatives whom he had referred to as "dogs." The officers apparently asked him to go to the police station so that his behaviour could be discussed.

Contact the writer: s.mukhopadhyay@ibtimes.com.au