An American soldier was killed in a mortar attack at Baghdad's Camp Liberty, AP quoted the U.S. military as saying. The military said the Multi-National Corps-Iraq soldier was killed Thursday at the base on the western edge of the Iraqi capital. The name of the soldier is being withheld pending notification of next of kin. The military said in a statement released Friday that the incident is under investigation. The death raises to at least 4,348 members of the U.S. military who have died in the Iraq war since it began in March 2003, according to an Associated Press count.