Witnesses said the explosion came at the canteen of an Iraqi Army base in Khales, 60 kilometers northeast of Baghdad.
Meanwhile, reports quote police and security sources as saying that a suicide car bomber slammed into two police cars on patrol in eastern Baghdad today, killing eight police officers.
Yesterday, a suicide bomber killed at least 22 people in Iraq's northern city of Kirkuk on a day when the Kurdish-dominated northern region officially received its first president.
A Sunni-Arab group (Army of Ansar al-Sunna) claimed responsibility for the blast in Kirkuk, the city that many Iraqi Kurds want as their capital.
RFE/RL Special: The New Iraq