7 of 37: Fire and smokes erupt during clashes between tribesmen loyal to Sheik Sadeq al-Ahmar, the head of the powerful Hashid tribe, and Yemeni security forces in Sanaa, Yemen, late Thursday, June 2, 2011. Thousands of tribesmen threatened Thursday to descend on Yemen's capital to join the battle against forces loyal to President Ali Abdullah Saleh as the country slid deeper into an all-out fight for power. Government forces in Sanaa unleashed some of the heaviest shelling yet against their tribal rivals in a dramatic escalation of the conflict. (AP Photo/Mohammed Hamoud) (AP Photo/ Mohammed Hamoud)

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