An open letter signed by more than two dozen Nobel Prize winners calls for the immediate release of political prisoners in Belarus. The letter, posted online on March 20 by opposition activist Dzmitry Bolkunets, was signed by four Nobel Peace Prize laureates, including Dmitry Muratov of Russia and Oleksandra Matviychuk of Ukraine. It also bore the names of three Nobel Prize winners for literature, including Belarusian writer Svetlana Alexievich, and 19 other Nobel laureates in various categories. "In recent decades, Europe has not seen a humanitarian catastrophe related to political repression on such a per capita scale as in Belarus," the letter said.