Description:At least three people were killed on Friday (January 25) when Iraqi troops opened fire during clashes in Falluja city with Sunni protesters rallying against Shi'ite Prime Minister Nuri al-Maliki, officials and witnesses said. It was the most serious violence since Sunni protesters began taking to the streets in late December to challenge Maliki's Shi'ite-led government and rally against what they see as the marginalisation of their minority sect.(0:36)