A well-known Vietnamese pro-democracy dissident has been released on bail after calling for a revolution inspired by protests in the Middle East, state-controlled media reported Tuesday.

Dr. Nguyen Dan Que was released on bail Sunday evening, a day after he was detained for allegedly attempting to overthrow Vietnam's Communist government, Tuoi Tre newspaper reported.

The newspaper quoted an unidentified Ho Chi Minh City police investigator as saying Que, 69, was released to his family because of his poor health and his cooperation with police.

Que, however, will be summoned for questioning when requested by the investigation agency, the report said.

Que was detained Saturday after allegedly being caught with thousands of anti-government documents on his computer. He was accused of calling on the masses to launch a Middle East-style uprising after posting an appeal online last week urging young people to use mobile phones and the Internet to spread the word for millions to take to the streets and demand an end to the government's one-party rule.

Que is a doctor who also heads the Non-Violent Movement for Human Rights in Vietnam. He has been jailed three times since 1978, serving a total of 20 years behind bars for promoting democracy and human rights. Vietnam considers his actions a threat to national security.