DUBAI, United Arab Emirates (AP) — A court in Bahrain has upheld a five-year prison sentence against prominent activist Nabeel Rajab over tweets alleging torture at a prison in his country and criticism of the Saudi-led war in Yemen.

Amnesty International says Bahrain's Court of Cassation upheld the conviction on Thursday on charges of "spreading false rumors in time of war," ''insulting public authorities" and "insulting a foreign country."

Rajab has been detained since June 2016 as part of a wide crackdown on dissent in Bahrain, a small island-nation off the Saudi coast that's home to the U.S. Navy's 5th Fleet.

Rajab was a major figure in the mostly Shiite-led protests in 2011 demanding greater rights from the Sunni-ruled monarchy. He's also serving a two-year sentence over television interviews he gave that included criticisms of Bahrain.