A suicide bomber killed 22 people and wounded at least 40 at the funeral of a Sunni grammar school principle just west of Baghdad, Iraqi police said. The bomber blew himself up inside a funeral tent in the village of Abu Minasir, just west of the capital. Police say that funeral was for Taha Obaid, the principle who was shot and killed one day before in his school. There was no reason known for Wednesday's killing, but many members of so-called Awakening Councils, Sunnis who switched allegiance and are now fighting al-Qaida, were attending the funeral. Col. Faisal al-Zubaie, the director of police in nearby Fallujah, says the original death toll was 18, but some people died later. Mosques were calling for donations of blood to treat those wounded in the explosion, says al-Zubaie.