Insurgents blew up an oil pipeline in the northern oil fields of Iraq and killed two senior police officers in Baghdad, officials said Monday. The oil field attack occurred at the North Oil Company's Al-Dibbis oil field near Kirkuk, said Maj. Gen. Anwar Mohammad Amin. The pipeline supplied oil for internal use and the damage will hamper the country's oil production, he said. It would take workers at least three days to extinguish the blaze and repair the pipeline, Amin said. In Baghdad, gunmen firing from a car killed two high-ranking policemen Sunday night, an Interior Ministry official said. He provided no other details. Insurgents also fired six mortars at a police station in central Baghdad, but there were no immediate reports of injuries, police said.