Hong Kong’s The Standard reports that Authorities have slapped Sina Corp with a fine of 5.1 million yuan (HK$6.3 million) over “unhealthy and indecent content”, the internet giant announced.

The “administrative fine” was imposed by the Beijing Municipal Cultural Market Administrative Law Enforcement Unit, Sina said.

Sina also said that the State Administration of Press, Publication, Radio, Film and Television notified it that the company’s “internet publication license and license for online transmission of audio-visual programmes would be revoked due to certain unhealthy and indecent content from third-parties or by users” on its online reading channel and website.

Sina “intends to fully cooperate with the relevant government authorities”.

Sina is the parent firm of hugely popular microblogging service Weibo, which listed on the Nasdaq stock exchange in April.

News of the punishment comes after the government said last month it plans to restrict Sina’s right to publish after finding pornographic content on the portal, and accused Sina of publishing 24 “pornographic and obscene” e-books, videos and audio programmes.

Authorities had said they planned to revoke two of Sina’s licenses to effectively bar it from publishing online books, video and audio content and charge it a “hefty” fine.

Sina had then issued an apology on its website, saying it was lax in controlling and monitoring some content. “We regret and are deeply ashamed of that,” it said.

Beijing last month announced a nationwide anti-pornography campaign aimed at “cleaning up the internet” to run until November 2014, according to state media reports.

China has repeatedly vowed to clamp down on online content that it calls “harmful” to minors. But critics say such efforts have been used to muzzle politically sensitive discussion on the web, whose fast-growing mainland user base has reached 618 million.