A top Russian official says there's no legal basis for reopening an investigation into the Katyn massacres, when thousands of Polish officers were killed by Soviet secret police.
Day: June 2, 2010
Three dead as Second World War bomb explodes in Germany
A Second World War bomb has exploded in central Germany, killing three people.
Timeline Challenge: The Chinese Civil War and the Rise of Mao
Students are put into teams and play this competitive game which tests their knowledge and develops their understanding.
