A volcano blasted ash two miles into the sky after erupting on Japan's southern island of Kyushu on Wednesday.<br /><br />Officials warned of a risk of large falling rocks and lava flows within a radius of about half a mile around the mountain's crater, but there were no immediate reports of casualties. <br /><br />Mount Aso erupted at about 11.43am local time (0343 BST), and the ash falls have been showering nearby towns in the prefecture of Kumamoto
