At least 20 people have been killed and as many again have been wounded in a suicide bomb attack in Iraq.The victims were police recruits queueing outside an interior ministry building in western Baghdad. A man walked up to the group before detonating his explosive device in the middle of the crowd. The recruiting centre has been attacked several times in the past, and is located just outside the city centre’s heavily fortified green zone. It is the worst such attack in nearly a week. This morning has also seen the burial of a leading aide to Iraq’s top Shi’ite cleric, Ayatollah Sistani. Thousands of people flooded the streets of the capital to pay an emotional farewell to Kamal al-Dine al-Ghoreifi, who was murdered yesterday along with two colleagues as they went to Friday prayers.