BAGHDAD, **v 12 (Reuters) - Suicide bombings and car bombs, including an attack on federal police headquarters, killed 23 people in Iraq on Wednesday, police, military and medical sources said. A car bomb, followed shortly afterwards by a suicide bombing, killed 11 people at the police building in al-Nisour Square in Baghdad, including six policemen. Twenty-one people were wounded. In Diyala province **rth of Baghdad, Army Colonel Faisal al-Zuhairi was killed when a suicide bomber in a Humvee attacked his convoy. Five of his men also died. ...