Bahrain's top court has rejected a final appeal by a prominent activist who was imprisoned for criticising Saudi Arabia's air attacks in Yemen and accusing Bahrain’s prison authorities of torture.

The verdict on Monday upheld a five-year prison sentence handed to Nabeel Rajab in February, according to a lawyer and a judicial source.

Bahrain, where a Sunni Muslim royal family rules over a Shia-majority population, has kept a tight lid on dissent since the Shia opposition staged a failed uprising in 2011.

Rajab, a leading figure in the 2011 pro-democracy protests, was sentenced for comments he made online accusing Bahraini authorities of prison abuse and criticising Saudi Arabia's role in the war in Yemen.

Al Jazeera's Andrew Chappelle reports.

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