A series of devastating attacks across Baghdad killed at least 75 people on Wednesday, in the worst day of carnage to hit the Iraqi capital since US troops pulled out of the conflict-hit nation's cities. Nearly 400 people were also wounded in two massive truck bombings outside government ministries, including one near the heavily-fortified Green Zone, a car bombing and a spate of mortar attacks. It was the bloodiest day in Iraq since February 2008, coinciding with the sixth anniversary of a truck bombing on the UN compound in Baghdad that killed UN special envoy Sergio Vieira de Mello and 21 other people. "I was in my home with my family when the roof collapsed on us," said Hamid, 46, who lives a few hundred metres from the foreign ministry compound which was targeted along with the finance ministry. "The government promised us security would return but where is the security?"