Renewed clashes between Yemeni police and southern separatists killed two civilians on Wednesday, five days ahead of the country\'s troubled national dialogue, medics and and activist told AFP. Police opened fire on Southern Movement activists who had blocked roads with rocks and burning tyres as part of a campaign of civil disobedience they began less than a month ago to call for southern independence, an activist said. Six people were wounded in the clashes, medics said.