>> reporter: the latest and subsidize phase to drive isis out of mosul, iraq's second largest city began at the crack of dawn. before iraqi prime minister announced the beginning of operations on iraqi television, iraqi and coalition aircraft and artillery pummelled isis targets in the western part of the city. overnight iraqi airplanes dropped millions of leaflets on mosul calling isis fighters to put down their weapons and surrender and warning civilians to stay in their homes and cooperate with iraqi forces. since then those forces have moved from the south and southwest towards the center of the city. their first objective to take mosul airport. resistance is expected to be fierce. isis has dug a complicated network of tunnels in the city and is already using armed