More than 60 people were arrested this weekend when police raided a gay bar in Shanghai.

According to AFP, police in the Chinese city said that patrons at Q bar were watching “pornographic” shows.

Police arrived in the early hours of Sunday morning and arrested staff, DJs and patrons, detaining some for 12 hours.

All were released on Sunday.

A report in the Shanghai Daily said police had not given details of the complaints against the bar.

But it quoted migrant workers who live in a shelter on the bar’s roof as saying that they sometimes saw naked men sitting on the roof and sometimes having sex.

One of the bar’s DJs, Steven Bao, wrote on his blog that he believed a rival gay bar had set them up.

Last month, 32 Chinese women were arrested for allegedly writing erotica for a gay website.

The women, include one 17-year-old, were arrested in Zhengzhou, the capital of Henan Province, for spreading obscene material.

In September, a reported 80 gay men were detained at an outdoor cruising site in Beijing.

China only decriminalised homosexuality in 1997 and it was seen as a mental illness until 2001.