Authorities have shut down 206 microblogs for distributing pornographic and vulgar content following investigations that were spurred by public tips, according to the State Internet Information Office (SIIO).

All of the accounts were registered at four of China's largest microblogging sites (Sina.com.cn, Sohu.com, 163.com and QQ.com), with 130 accounts set up through Sina, according to a statement released Friday by the office.

"Relevant departments have criticized these sites for their slack management and have warned them to rectify their misconduct," the statement said.

The SIIO has urged the country's microblog providers and Internet portals to fulfil their legal and social obligations and "refuse to be used as a platform to spread obscene material."

"The SIIO and other departments will strengthen supervision over microblogs and other technology-based content in accordance with laws and regulations," the statement said.