Bahraini opposition protesters march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Bahraini opposition protesters face-off with police during a march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Opposition protesters take cover after being fired upon by police during an opposition march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Pro-government supporters break through police lines and attack an opposition march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
An opposition protester throws a flower at police during a march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Bahraini opposition protesters march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Opposition protesters point police in the direction of an attack against them by pro-government supporters (not seen) during an opposition march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Bahraini opposition protesters march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Bahraini opposition protesters face-off with police during a march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Opposition protesters take cover after being fired upon by police during an opposition march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Pro-government supporters break through police lines and attack an opposition march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
Bahraini opposition protesters face-off with police during a march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
A young child offers a flower to police during an opposition march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
A young protester offers a flower to police during an opposition march on Riffa, south of the capital Manama 11 March 2011. Bahraini anti-riot police clashed with opposition protesters on the outskirts of Riffa Friday 11 March 2011 after pro-government supporters were able to pass through police lines and attack the opposition march, leaving 774 people injured according to the health ministry, mainly due to tear-gas inhalation. EPA/MAZEN MAHDI
