(KUNA) -- Three Iraqi soldiers were killed and three others were wounded in a roadside bomb planted on the Kirkuk-Riyadh road south-west of Kirkuk. An Iraqi police source in Kirkuk told KUNA three soldiers were killed and three others were wounded when their patrol was struck by an improvised-explosive device south-west of Kirkuk.Meanwhile, an Iraqi army source said around 13 terrorists were arrested during an inspection campaign in Al-Huwaija area. Among the arrested, were four top terrorists in the area in addition to the confiscation of a large number of weapons and explosives.