The latest UN censure came as international experts, including London-based human rights lawyer Amal Clooney, petitioned the world body over the controversial jailing of Mohamed Nasheed for 13 years.
The UN Human Rights Office said their delegation, which visited Male late last month, found that the country's first democratically elected leader had been subjected to a "rushed trial" under a system that was highly politicised.
"The trial of Mr Nasheed was vastly unfair and his conviction was arbitrary and disproportionate," the UN rights body said in a statement issued from Geneva. He was convicted on a charge of ordering the arrest of an allegedly corrupt judge when he was in power in 2012.
The Indian Ocean atoll nation's image as an upmarket tourist destination has been dented due to almost daily protests in the capital island Male, where Nasheed's supporters were staging another mass demonstration today.
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Police fired teargas in addition to using pepper spray on protesters, and some hit back using plastic bottles and placards.
Witnesses said many among the thousands of protesters had been injured, while Nasheed's loyalists said several had been detained.
Nasheed's wife, Laila Ali, made an impassioned appeal for his release during a visit to Washington Thursday to lobby US officials and lawmakers and pressure the Maldivian government.
"This is a very difficult time for me and my children, but today I also have hope," Ali told reporters in Washington yesterday.
Addressing the same meeting, Clooney described Nasheed as a "political prisoner" who was "wrongly convicted" at the conclusion of "a sham trial."
Clooney said: "In our filing, we ask the UN to rule that president Nasheed's detention is arbitrary and illegal under international law."