In Yemen, violence has again broken out in capital Sana. Shots were heard in the early hours of morning. Witnesses said two rockets hit a camp in the capital, killing two people. Heavy shelling and machine gun fire was heard. Fighting engulfed parts of Yemen's capital Sana'a yesterday as forces loyal to embattled President Ali Abdallah Saleh clashed with military units who have joined the opposition. Mediation efforts by the Gulf Cooperation Council and the United Nations appear to be meeting with resistance. Medical officials in Yemen say more than 50 people died and hundreds were wounded in the two days of violence that followed anti-government protests in the capital.