A recent undated file picture shows Yemeni General Ali Mohsen al-Ahmar (C) during a visit to troops deployed in Saada province in southern Yemen. Ahmar, commander of the Northwest Military District which includes Sanaa, announced on March 21, 2011 that he had joined the 'revolution' against President Ali Abdullah Saleh's regime.




General Ali Mohsen, commander of Yemen's northwest military zone, announces on television that his unit will be joining the non-violent revolution in this still image taken from video March 21, 2011. Top generals, ambassadors and some tribes threw their support behind Yemen's anti-government protesters on Monday in a major blow to President Ali Abdullah Saleh as he tries to survive growing demands for his immediate departure.




Yemeni armored personnel carriers (APC) guard the Yemeni Central Bank in Sanaa,Yemen, Monday, March 21, 2011. Three Yemeni army commanders, including a top general, defected Monday to the opposition calling for an end to President Ali Abdullah Saleh's rule, as army tanks and armored vehicles deployed in support of thousands protesting in the capital. With the defection, it appeared Saleh's support was eroding from every power base in the nation _ his own tribe called on him to step down, he fired his entire Cabinet ahead of what one government official said was a planned mass resignation, and his ambassador to the U.N. and human rights minister quit.





Yemen's President Ali Abdullah Saleh (L) meets with defence force officials in Sanaa in this still image taken from video March 21, 2011. Yemen, a key ally of the United States and Saudi Arabia against al Qaeda, has seen a steady stream of increasingly high-level defections since plainclothes snipers firing from rooftops shot dead 52 protesters on Friday after Muslim prayers.




Yemen's Defence Minister Mohammad Nasser Ali reads a statement on state television in Sanaa in this still image taken from video March 21, 2011. Yemen's defence minister said on Monday that the army supports President Ali Abdullah Saleh and will defend him against any "coup against democracy", according to the statement.





Anti-government protesters shout slogans during a rally demanding the ouster of Yemen's President's Ali Abdullah Saleh in Sanaa March 21, 2011. Top generals, ambassadors and some tribes threw their support behind Yemen's anti-government protesters on Monday in a major blow to President Ali Abdullah Saleh as he tries to survive growing demands for his immediate departure.