A number of people were injured in a stabbing at a church in Walkley, about 30 km (18 miles) west of the Sydney central business district, police authorities said on Monday.
Officers arrested a male and he is assisting police with inquiries, a police statement said.
The injured people suffered non-life threatening injuries and are being treated by paramedics, police said.
Local media reported that a church leader and several worshippers were stabbed during a service at the church. Videos of the incident circulating online showed a man lunging and stabbing a speaker.
Its the second stabbing incident in Sydney after six people were killed in a knife attack at a mall in Sydney's Bondi area on Saturday.
