In Yemen, 13 people were wounded today when police stormed a protest camp in the southern port city of Aden. Reports from Capital Sanaa says, police fired live rounds and tear gas as President Ali Abdullah Saleh's crackdown on dissent continued.The attack was followed by clashes after thousands of people surrounded the al-Mualla police station trying to break in. But police were holding them off, firing in the air.In Sanaa, soldiers in tanks and armoured personnel carriers took up positions at intersections and key buildings including the presidential palace, the state TV building and other government institutions.The army also set up checkpoints where soldiers searched motorists and passersby near the encampment site next to Sanaa University.Today' raid follows escalation in violence yesterday, when security forces in Sanaa, killed at least 46 people and injured hundreds.The US has condemned the violence.