A truck bomb that detonated outside a Shiite mosque in one of Baghdad's commercial centers Tuesday killed at least 78 people. A reporter gives the latest on the incident and on other developments in the country, including a new U.S.

Since November, dozens of U.S. service members have been killed in Diyala, making it one of Iraq's deadliest provinces. Iraqis have not escaped the violence either. Military analysts discuss the persistent insurgency.