USA: Marchers clash with police outside NATO summit in Chicago focused on Afghanistan.
South Korea: US, Japanese and South Korean officials meet in Seoul as North Korea is said to be preparing third nuclear test.
Yemen: Suicide bomber kills 63 at military parade rehearsal in the Yemeni capital, Sanaa.
Italy: Many historic sites feared damaged after massive earthquake in northern Italy.
Rare annular solar eclipse observed in many parts of the world.