A number of people were injured in a stabbing at a church in the suburb of Wakely, about 30 kilometres west of the Sydney central business district, Australian police authorities said on Monday.

Officers arrested a male, 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.

The Christ the Good Shepherd Church is described as an Assyrian Christian church. According to 7News in Sydney, the church's service was being streamed on its social media channel when the incident occurred.

It's the second recent stabbing incident in Sydney after six people were killed in a knife attack at a mall in Sydney's Bondi area on Saturday.