Soldiers fired one live round and tear gas at opposition supporters on Sunday in a clash outside a polling station in Zanzibar's historic Stone Town, witnesses said. The soldiers poured in when opposition supporters reacted angrily to the arrival of scores of government supporters in vehicles shepherded by the military, Reuters witnesses said. The military chased away opposition supporters, who had been hurling stones, while helping pro-government voters line-up in queues outside the polling station. "CUF is bringing chaos. We will not allow it," one soldier said in reference to the opposition Civic United Front (CUF). About half the one million people on Tanzania's semi-autonomous Indian Ocean archipelago are eligible to vote in the poll that is too close to call between the CUF and Chama Cha Mapinduzi (CCM), in office since a 1964 revolution.