Four hostages, who were being held in northern Burkina Faso, are rescued by French naval commandos, with two French commandos killed during the rescue operation. Those freed include two Frenchmen who had been kidnapped in Benin on May 1 and a pair of women, one an American and the other a South Korean.
North Korea shells Yeonpyeong island, South Korea at 14:34 local time in response to South Korean shelling close to the North Korean border during military drills. The North's shelling kills two marines and prompts a military response by the South in one of the most serious clashes since the 1953 armistice of the Korean War.
South Korea begins a huge anti-submarine exercise in the Yellow Sea, near the disputed maritime border, in what it sees as a show of strength against North Korea and "to be fully prepared for combat"; North Korea disapproves of the exercise.
An arson attack on an underground train in the Daegu, South Korea, claims lives of 192 and 148 injured and dozens missing. Witnesses reportedly saw a man throwing a milk carton filled with a flammable substance into a train.