Burma's military rulers have sentenced two opposition leaders to 10 years in jail, their toughest move yet against the party that won May's general election, a political source said Tuesday.

In New York Monday, the U.N. General Assembly took up a resolution demanding that the government free its political prisoners and expressed concern about its failure to hand power to the National League for Democracy after its landslide poll victory.A military tribunal in Rangoon sentenced the league's Kyi Maung and Chit Khaing on Monday, said the source, who was reached in the Burmese capital from Bangkok and spoke on condition of anonymity.

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