Police in the southern Chinese city of Guangzhou have arrested a man for secretly filming his former female classmates and sharing sexually explicit images and videos of them on Twitter, the city’s public security bureau said Wednesday.

The arrest came after a woman wrote on microblogging platform Weibo that the man, surnamed Gao, had shared photos and videos of his former classmates in various states of undress via a now-deleted Twitter account. One video posted on the account purportedly showed the man mixing his semen into one woman’s drinking water.

The Weibo post has now been shared over 165,000 times, with many angry users tagging the Guangzhou police and Gao’s employer. Social media users also uncovered several Chinese-language Twitter accounts encouraging people to secretly photograph or film their female friends and relatives and share explicit content online.

In March, police in the eastern city of Yangzhou said they were investigating a high school student on suspicion of posting his female classmates’ selfies, paired with random nude photos, on porn websites. The case prompted China’s anti-porn office to crack down on several domestic websites that were found to be selling or distributing sexually explicit photos and videos, especially those involving minors. (Image: VCG)