Description:REUTERS Iraqi troops shot dead at least four people during clashes with Sunni Muslim protesters in Falluja on Friday (January 25), in escalating unrest against Shi'ite Prime Minister Nuri al-Maliki. A Reuters witness said troops initially fired in the air to disperse crowds, but then he saw some soldiers fire towards protesters who had approached their military vehicles and set one of them on fire. Thousands of Sunnis have taken to the streets to protest against mistreatment of their minority(1:43)