A roadside bomb exploded Saturday in the southern Baghdad neighborhood of Dora, killing three Iraqi soldiers, the army said. At least one civilian was killed in fierce fighting between insurgents and the army in Fallujah, police Lt. Mohammed Khalaf was quoted as saying by the Associated Press. In the southern city of Basra, four gunmen killed the director of traffic police as he was driving to work, police said. Basra is 340 miles southeast of Baghdad.