A Chinese scholar and rights advocate who founded an influential non-governmental think tank has been detained on the criminal charge of provoking troubles.

Beijing-based lawyer Li Jin confirmed Sunday that her client Guo Yushan was detained by Beijing police last week.

Guo is the latest of dozens of people who have been detained at a time when Hong Kong is waging a prolonged pro-democracy protest to demand universal suffrage in elections for the top official of the semiautonomous territory.

Li says she is yet to meet with Guo and it wasn't immediately clear on what basis police charged Guo.

Guo co-founded the Transition Institute to research China's social and economic issues, but Beijing's authorities, citing lack of proper registration, shut down the think tank last year.