Deputy Police Chief Brigadier Hossein Ashtari made the remarks at a meeting with Iraq’s top-ranking border guard official Brigadier Ali Wahham Jabbar in the border town of Shalamcheh.
Ashtari conveyed Iran's readiness to support Baghdad government in its fight against terrorism.
The presence of people in Iraq on Arbaeen is a preventive threat to ISIL terrorist groups in the country and their foreign agents, he said.
Arbaeen is a Shia religious observation that falls 40 days after Ashura, the day of martyrdom anniversary of Imam Hussein, the third Shia Imam of Prophet Muhammad.
The Iraqi official, for his part, stressed strategic relations between Iran and Iraq and stated that cooperation of the two neighbor countries in the fight against Takfiri groups, ISIL in particular, is inevitable.
He noted that today Iran and Iraq are united to stand against a common enemy.