An Iraqi university student shouts slogans during a protest in central Baghdad, Iraq. EPA
Anti-government protesters wear hazmat suits and gas masks during a protest to condemn the militia attack on Najaf protesters late on Wednesday night, in Tahrir Square, Baghdad, Iraq. AP Photo
Protesters chant slogans while holding a poster of prime minister-designate Mohammed Allawi with the slogan, "Rejected by the people," during a demonstration in Najaf, Iraq. AP Photo
An Iraqi university student holds a placard reading in Arabic 'you do not burn tents, but you are fuelling revolution' during a protest in central Baghdad, Iraq. EPA
Students and other demonstrators hold national flags during a protest to condemn a militia attack on Najaf protesters late on Wednesday night, in Tahrir Square, Baghdad, Iraq. AP Photo
Protesters chant slogans during a protest to condemn the militia attack late-night Wednesday, in Najaf, Iraq. AP Photo
Iraqi university students take part in a protest in central Baghdad, Iraq. EPA
Iraqi university students hold photos of protesters allegedly killed in the continuing unrest during a protest in central Baghdad, Iraq. EPA
Iraqi university students take part in a protest in central Baghdad, Iraq. EPA
Iraqi university students hold up pens and shout slogans during a protest in central Baghdad, Iraq. EPA
An Iraqi university student with mouth taped attends a protest in central Baghdad, Iraq. EPA
An Iraqi university student with mouth taped attends a protest in central Baghdad, Iraq. EPA
An Iraqi university student shouts slogans during a protest in central Baghdad, Iraq. EPA
Anti-government protesters wear hazmat suits and gas masks during a protest to condemn the militia attack on Najaf protesters late on Wednesday night, in Tahrir Square, Baghdad, Iraq. AP Photo
Protesters chant slogans while holding a poster of prime minister-designate Mohammed Allawi with the slogan, "Rejected by the people," during a demonstration in Najaf, Iraq. AP Photo
An Iraqi university student holds a placard reading in Arabic 'you do not burn tents, but you are fuelling revolution' during a protest in central Baghdad, Iraq. EPA
Students and other demonstrators hold national flags during a protest to condemn a militia attack on Najaf protesters late on Wednesday night, in Tahrir Square, Baghdad, Iraq. AP Photo
Protesters chant slogans during a protest to condemn the militia attack late-night Wednesday, in Najaf, Iraq. AP Photo
Iraqi university students take part in a protest in central Baghdad, Iraq. EPA
Iraqi university students hold photos of protesters allegedly killed in the continuing unrest during a protest in central Baghdad, Iraq. EPA
Iraqi university students take part in a protest in central Baghdad, Iraq. EPA
Iraqi university students hold up pens and shout slogans during a protest in central Baghdad, Iraq. EPA
An Iraqi university student with mouth taped attends a protest in central Baghdad, Iraq. EPA
An Iraqi university student with mouth taped attends a protest in central Baghdad, Iraq. EPA
An Iraqi university student shouts slogans during a protest in central Baghdad, Iraq. EPA
Iraq's Grand Ayatollah Ali Al Sistani condemns deadly attacks on protesters
Top Shiite cleric says no excuse for security forces not to defend anti-government demonstrators