"This very unfortunate matter is in the hands of the police".
"With that knife he stabbed a 24-year-old".
The 24-year-old died at the hospital.
An older man, also an employee, was injured "superficially" and was in a stable condition.
The Daily Telegraph reported the teen went to the church to see his mother.
Both victims were members of the Scientology center. We can not make any further comment beyond the fact that the victim was a beloved member of our Church.
In video footage of the aftermath of the attack seen by Express.co.uk, police can be seen leading the teenage suspect away from the vast complex on Grenville Street.
The teenager was believed to be a member of a Scientologist family who had been asked to leave the premises over a domestic incident the previous day, the Sydney Morning Herald reported.
A 16-year-old boy has been arrested and is assisting police with inquiries.
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Staff had asked him to leave "solely" because of Wednesday's incident, the policeman said, adding he would not elaborate further.
"The Church is providing the police with any assistance needed in their investigation", it said.
"I think they know they have a bit of a bad name so they bent over backwards to make sure they fit in", she told reporters at her home.
"It's a huge building, a lot of people come from around Asia to study here", he said.
The facility, which spans some 145,000 sq. feet, is considered to be the church's biggest center outside the United States territory.
"It offers a lot of services".
The 13,500 square metre property in Sydney's north is the largest Scientology centre outside the U.S., the Australian Broadcasting Corporation reported.
The site - which borders the Lane Cove national park - was snapped-up for about $37 million by the secretive group, who outlaid another $20 million in renovations and construction.
Also known as the Advanced Organization and Saint Hill Australia, New Zealand & Oceania, the facility was described as the "spiritual headquarters" in the Asia Pacific region when it was opened by church leader David Miscavige two years later.