Thousands of tribesmen threatened 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.

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Yemen's embattled President Ali Abdullah Saleh was wounded on Friday along with his premier and other officials as shells struck a mosque in the presidential palace compound, a security official said.

Thirty-seven people were killed in overnight clashes between opposition tribesmen and security forces after a truce, that had ended four days of fighting in the Yemeni capital, collapsed, a medic said on Wednesday

Republican Guard shelling and pre-dawn street battles between government forces and rival tribal fighters killed at least 41 people in the capital today.

There were growing signs of disarray in

Fierce fighting erupted around the Sanaa home of dissident tribal chief Sheikh Sadiq al-Ahmar today as a truce that ended deadly clashes last week broke down.

There were also heavy exchanges betw

Yemeni security forces killed 20 demonstrators when they broke up a four-month-old sit-in in the
second-largest city Taez during the night, protest organisers said on Monday.

"At least 20 protesters

Yemen teetered on the verge of civil war on Friday as President Ali Abdullah Saleh defied calls from opponents and world leaders for him to relinquish power.

More than 40 Yemenis were killed in pitch

An ammunition store belonging to the powerful Al-Ahmar tribe has exploded in the Yemeni capital Sanaa killing 28 people, the defence ministry's 26sep.Net news website said on Thursday.

An eyewitness and military officials say an explosion ripped through a Yemeni military vehicle in the south killing five soldiers, while four civilians were killed in the ensuing firefight.

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Embattled President Ali Abdullah Saleh has accused Qatar of a "conspiracy" and threatened to pull out of a Gulf Cooperation Council (GCC) transition deal to end the violence in Yemen.