A local Buddhist association has vowed to sue media outlets and netizens, after a video allegedly showing members partying at a nun's wedding went viral.

The Wutaishan Buddhist Association (WBA) of North China's Shanxi Province accused media of "tarnishing Buddhism" over the video.

Most men and women in the video were bald, in robes, and busy taking pictures of themselves or a group. Some people shouted "unify the world", and some were seen holding a board with characters "Wuxingbi".

In a statement issued over the weekend, the WBA claimed that the guests were actually members of a pyramid scheme called "Wuxingbi," whose members shave their heads.

WBA lawyer Wei Haisheng told media on Sunday that the association had reported the case to police.

"It's time for us to take actions to defend the reputation of Buddhism,” he said.