A female official with the Census Department was shot to death Wednesday while she was riding to work with her husband in northern Iraq, police said. Gunmen in two cars opened fire on the woman about 9:30 a.m. as her husband was driving her to work at the Nationalities and Census Department in Mosul, 360 kilometers northwest of Baghdad, police Brig. Abdul Karim al-Jubouri said. At least five other people were killed in morning attacks in the Baghdad area as frustration is mounting over delays in the implementation of a US-Iraqi security operation to quell the sectarian violence that has left the capital a battlefield. Two mortar shells landed on houses in a mainly Sunni area in northeastern Baghdad, killing one civilian and wounding seven, police said. Three people also were killed in a drive-by shooting as they were driving in the volatile Sunni Yarmouk neighborhood in a western part of the capital, according to police. A roadside bomb also struck a joint US-Iraqi patrol on a highway east of Baghdad, killing an Iraqi police officer and wounding three others, police said. Roadside bombs also killed a woman and wounded two other people in Suwarah, 40 kilometers south of the capital, as well as the driver of a private car elsewhere in a nearby area, police said.