Belarusian protest leader Maria Kolesnikova has been abducted by unidentified people in central Minsk, according to the Belarusian Tut.By media outlet, which cited an eyewitness. Al Jazeera reports that the development on Monday came hours after security forces arrested 633 protesters following a mass anti-government rally on Sunday, the latest since the disputed August election. Police in Minsk have meanwhile said that they had not arrested Kolesnikova.