According to law enforcement, the incident occurred at around 13:00 local time at the Scientology centre on Greville Street.
"The police officers arrived at the centre after a report of an armed attack. Two injured men and a teenager who attacked them were found at the scene. The victims were immediately taken to the Royal Hospital and the assailant arrested," the police said.
According to reports, the incident happened in the driveway of the centre; the boy had been asked to leave the premises and was being escorted by the two men when he produced a 25 cm “very sharp kitchen knife”, according to news.com.au. The teenager who had attacked two men did not resist arrest and was taken to a local police station; the investigation continues.
The Centre for Scientology in Sydney, opened in September 2016, is the key headquarters of the organisation in the Asia-Pacific region.