China has extended its anti-porn campaign to mobile WAP sites, according to the Ministry of Public Security (MPS) on Tuesday.

The effort will last until the end of this year because the porn WAP sites have a long invisible chain involving overseas sources which adds to its complexity, an official with the ministry said.

WAP sites can be accessed by a mobile phone.

The official said the campaign will be focused on Shanghai, Beijing, Guangdong, Zhejiang and Anhui, where many WAP sites are registered.

China Internet Illegal Information Reporting Center (CIIRC) said Tuesday the tip-offs of porn WAP sites it received have been on the rise.

Latest statistics showed 1,179 people have been detained and 6,972 websites and online columns have been shut down. Among them, 586 were porn mobile WAP sites and columns.

During the campaign, authorities in Shanghai detained seven people for profiting from lewd items through mobile WAP sites. The authorities in neighboring Zhejiang province busted a ring specializing in spreading porn content via more than 100 WAP sites and arrested 38 suspects.