At least two policemen were killed and three others injured  when a suicide bomber drove a car full of explosives to their checkpoint near the northern Iraqi city of Kirkuk today.  Police said the attack took place in the town of Abbasi. <br />''<br />''No group has claimed responsibility for the attack. Yesterday, a suicide car bomb attack on a security checkpoint killed at least eight people, including five militiamen and three civilians in western Iraq.<br />''<br />''<br />''<br />''<br />''<br />''<br />''<br />''<br />''<br />''<br />''<br />''<br />