Insurgents lobbed 10 mortars Thursday at the provincial administration offices in the northern city of Mosul, wounding four of the governor's guards, the U.S. military and local officials said. Governor Duraid Kashmoula was unhurt in the attack that came around 11:30 a.m. (0830GMT), said spokesman Lt. Col Paul Hastings. However, four members of his security detachment were injured, he said. Initial reports said the mortars landed near a fuel truck, setting it ablaze, Hastings said. The mortars, about 10 of them, were lobbed from houses surrounding the governor's offices with more than a million residents, remained more stable for a second day since the U.S.-led offensive operation began on Tuesday to wrest control of the western part of the city from insurgents.