An online streaming website shows a description of American TV show "The Big Bang Theory" but it no longer have access to episodes in the series on a computer screen in Beijing Sunday. Pic: AP.

BEIJING (AP) — Chinese online video sites say authorities have ordered them to stop showing four popular American TV shows, including “The Big Bang Theory” and “The Good Wife.”

The move suggests government attention is intensifying on the online streaming industry, which is less regulated than state-controlled television.

A spokeswoman for Youku said Sunday that the online video streaming site had received notification not to show “The Big Bang Theory,” ”The Good Wife,” ”NCIS” and “The Practice.” She said the State Administration of Press, Publication, Radio, Film and Television didn’t give a reason for its order.

A senior manager at another video streaming site said it received an order last week to “clean their website.”