'Detained Columbia University Scholar Charged'

A Chinese-Australian writer detained in Beijing since January was charged on Thursday and moved to a different detention centre in the capital, his lawyer said.

Australian lawyer Rob Stary said he had been told by Yang Hengjun's family and friends of the charge and was seeking confirmation from Australia's Department of Foreign Affairs and Trade.

Stary said he did not know what the 53-year-old visiting scholar at Columbia University in New York had been charged with.

"It's an offence under their state security laws. We expect it will be some form of espionage or something of that nature," Stary said.

Mainland authorities had until July 27 to decide whether they would charge the novelist and former Chinese diplomat. His six-month detention order is due to expire on that date.

He has been detained since January 19, when he arrived from New York at Guangzhou Airport with his wife, Xiaoliang Yuan, and his 14-year-old stepdaughter.

China in January said Yang had been detained for allegedly endangering national security, a vague charge frequently levelled at critics of the ruling Communist Party.

Foreign Minister Marise Payne did not immediately respond to a request for comment on Thursday.

Chinese Foreign Ministry spokesman Geng Shuang said on Wednesday that Yang's case remained under investigation.

Geng also said Yang was in "good condition." (AFP)