He has been sentenced for criticizing Saudi Arabia’s air strikes in Yemen and accusing Bahrain’s prison authorities of torture, his lawyer said.

Bahrain has kept a lid on dissent since the opposition began an uprising in 2011. Saudi Arabia and other Persian Gulf states sent in troops to help crush the uprising.

Rajab, a leading figure in the 2011 pro-democracy protests, was sentenced to five years in prison in February for criticizing the Saudi air strikes and writing tweets accusing authorities of torture.

He was already serving a two-year term over a news interview in which he said Bahrain tortured political prisoners.

“The Court of Cassation rejected the appeal and upheld the sentence of five years in prison against Nabeel Rajab for his tweets,” his lawyer, Mohamed Al Jishi, told Reuters by phone.

The convictions were for “spreading false news and rumors in time of war”, “insulting foreign countries” and “insulting publicly the interior ministry” in comments posted on Twitter, a court document see by Reuters showed.

International rights groups that have been calling for Rajab’s immediate and unconditional release denounced the ruling.

Bahrain, which is home to the US Navy’s Fifth Fleet, has closed the main opposition groups, barred their members from running in elections and prosecuted scores of people, many described by human rights groups as activists, in mass trials.