In Iraq, at least 28 people including 18 Iraqi police officers have died in another day of violence. The deadliest attack took place near Tikrit where gunmen killed 12 police officers. Four other attacks were waged on nearby police checkpoints. Meanwhile in Baquoba, gunmen assassinated a local police commander. In the village of Muradiya a car bombing killed five civilians. And in Baghdad, a suicide car bomber tried to assassinate a senior Iraqi National Guard officer as he was leaving his home. The officer was unhurt in the attack but eight others were injured.