Hundreds of anti-government protesters marched Wednesday in southern Iraq to mourn a dead activist after a night during which the headquarters of two pro-Iran militias were set on fire, an AFP correspondent reported. The demonstrators oppose the political class that has run the oil-rich yet poverty-hit country since a 2003 US-led invasion overthrew dictator Saddam Hussein. Thaer al-Tayeb, a prominent activist from the city of Diwaniya, went to Baghdad’s Tahrir Square, the epicentre of the unprecedented revolt shaking Iraq, when the rallies started nearly three months ago.