Activists say Syrian authorities have released a prominent journalist and human rights activist after more than three years' imprisonment.

Mazen Darwish was the director of the Syrian Center for Media and Freedom of Expression when he was arrested in February 2012 along with two of his colleagues. The organization confirmed his release on Monday.

He was an outspoken critic of the government's crackdown on protesters that erupted in the country against President Bashar Assad's rule in March 2011.

He has been standing trial on charges of "publicizing terrorist acts."

International human rights organizations have long called on the Syrian government to release Darwish.