Bahraini anti-government protesters sleep at the Pearl roundabout in Manama, Bahrain, Monday, Feb. 21, 2011. The writing in Arabic: " The nation wants down with the regime". (AP Photo/Hassan Ammar)
Bahraini riot police seen near the Pearl roundabout during clashes with anti government protesters, in Manama, Bahrain, early Thursday morning, Feb. 17, 2011. Some protesters appeared unbowed as armed patrols prowled neighborhoods and tanks appeared in the streets for the first time Thursday after riot police with tear gas and clubs drove protesters from a main square where they had demanded sweeping political change in this tiny kingdom. Medical officials said four people were killed. (AP Photo/Hassan Ammar)
Bahraini riot police seen near the Pearl roundabout during clashes with anti government protesters, in Manama, Bahrain, early Thursday morning, Feb. 17, 2011. Some protesters appeared unbowed as armed patrols prowled neighborhoods and tanks appeared in the streets for the first time Thursday after riot police with tear gas and clubs drove protesters from a main square where they had demanded sweeping political change in this tiny kingdom. Medical officials said four people were killed. (AP Photo/Hassan Ammar)
A Bahraini anti-government demonstrator holds up a national flag near Pearl Square in capital Manama early Thursday morning, Feb. 17, 2011. The swelling protests against Bahrain's rulers gained momentum Wednesday with huge crowds calling for a sweeping political overhaul and the kingdom's stunned leaders appearing to shift tactics after attempts to crush the uprising stoked rage on the streets and sharp criticism from Western allies. (AP Photo/Hassan Ammar)
Anti-government demonstrators run away after being attacked by Bahraini riot policemen at Pearl Square, in Manama, Bahrain, early Thursday morning, Feb. 17, 2011. Riot police firing tear gas and rubber bullets stormed the landmark square occupied by anti-government protesters Thursday, driving out demonstrators and destroying a makeshift encampment that had become the hub for demands to bring sweeping political changes to the kingdom. (AP Photo/Hassan Ammar)
Bahraini riot policemen are seen after attacking peaceful demonstrators camping at Pearl Square in capital Manama early Thursday morning, Feb. 17, 2011. Riot police firing tear gas and rubber bullets stormed the landmark square occupied by anti-government protesters Thursday, driving out demonstrators and destroying a makeshift encampment that had become the hub for demands to bring sweeping political changes to the kingdom. (AP Photo/Hassan Ammar)
Anti-government demonstrators' damaged tents at Pearl Square in Manama, Bahrain, early Thursday morning, Feb. 17, 2011, after riot police attacked them. Riot police firing tear gas and rubber bullets stormed the landmark square occupied by anti-government protesters Thursday, driving out demonstrators and destroying a makeshift encampment that had become the hub for demands to bring sweeping political changes to the kingdom. (AP Photo/Hassan Ammar)
In this image from video Bahraini riot police firing tear gas and wielding clubs storm Pearl Square, occupied by anti-government protesters, before dawn Thursday, Feb. 17, 2011, driving out demonstrators and destroying a makeshift encampment that had become the hub for demands to bring sweeping political changes to the kingdom. (AP Photo/Tony Mitchell, HO)
In this picture taken Tuesday Feb. 15, 2011, the body of 20-year-old Ali Abdul Hadi Mushaima, alledgedly killed in clashes with security forces Monday, is prepared for burial in Daih, Bahrain. He was one of two people killed Monday in the protests demanding sweeping political reforms. On Thursday, according to medical officials four more people were killed after riot police drove protesters from a main square in Manama. (AP Photo/James Lawler Duggan)
