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An anti-government protester wears an improvised gas mask during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Anti-government protesters march during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

An anti-government protester gives water to army soldiers riding an armoured personnel carrier deployed to block a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

An anti-government protester kisses an army soldier riding an armoured personnel carrier (APC) deployed to block a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

An army soldier stands on an armoured personnel carrier (APC) blocking demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah)

An anti-government protester tries to kiss an army soldier at a barricade blocking a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

An army soldier stands on an armoured personnel carrier (APC) blocking demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Anti-government protesters march during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Army soldiers stand on an armoured personnel carrier (APC) blocking demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

An anti-government protester shouts at a soldier standing guard during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz, April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

An anti-government protester scuffles with soldiers during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Soldiers stand guard during an anti-government demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Soldiers stand guard during an anti-government demonstration to demand for the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Soldiers stand guard during an anti-government demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Soldiers block an anti-government demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz, April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Soldiers block an anti-government demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Girls hold balloons during a demonstration to demand for the ouster of Yemen's President Ali Abdullah Saleh, outside Sanaa University, April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Ammar Awad

A women holds a flag during an anti-government rally outside Sanaa University April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Ammar Awad

Women pray during a rally to demand for the ouster of Yemen's President Ali Abdullah Saleh, outside Sanaa University April 7,2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Ammar Awad

A woman attends an anti-government rally to demand for the ouster of Yemen's President Ali Abdullah Saleh in Sanaa University April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Ammar Awad

Women shout slogans during an anti-government rally outside Sanaa University April 7,2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Ammar Awad

An anti-government protester tosses a rose towards a soldier standing guard on an armoured personnel carrier, during a demonstration demanding the ouster of Yemen's President Ali Abdullah Saleh, in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

Anti-government protesters carry defaced pictures of Yemen's President Ali Abdullah Saleh during a demonstration in the southern city of Taiz April 7, 2011. Saudi Arabia and its Gulf allies are trying to broker a deal to have Yemen's president step down and hand over power, possibly to an interim council of tribal and political leaders, sources told Reuters on Wednesday. REUTERS/Khaled Abdullah

The Arab Revolution of 2011