BAGHDAD : A post-election wave of attacks across Iraq, including car bombings in Baghdad and a northern city, killed at least 74 people, officials said Thursday.The compiled death toll for Wednesday, with the number rising to 74 after late-night attacks, made it the bloodiest single day in Iraq in more than seven months. The wave of violence could further destabilise Iraq as political leaders jostle to build alliances and form a government following April 30 elections that left PM Nuri al-Maliki in the driver’s seat for a third term in power. In Baghdad’s deadliest attack, a suicide bomber detonated a vehicle rigged with explosives in north Baghdad, killing at least 16 people and wounding 52, security and medical officials said, on condition of anonymity.