Belarus opposition leader Svetlana Tikhanovskaya has urged the UN to help halt the authorities' crackdown on protesters. She said the options should include UN sanctions targeting individuals close to Alexander Lukashenko, who she said was "desperately clinging to power". On Friday police in Minsk arrested five university students who were in a group singing a protest anthem from Les Miserables.Mass anti-Lukashenko protests continue. Videos posted on Twitter showed chaotic scenes at the Minsk State Linguistic Institute on Friday, with police dragging students away through crowded corridors. Ms Tikhanovskaya, who was forced to go into exile in neighbouring Lithuania, urged the UN via video link to send an international monitoring mission to Belarus immediately to "document the situation on the ground". "A nation cannot and should not be hostage to one man's thirst for power. Belarusians have woken up, the point of no return is passed," she told the UN informal meeting called by Estonia, one of Lithuania's Baltic neighbours.