(CNN) ISIS has carried out two attacks on Iraqi border posts along the border with Syria following the US decision to suspend counter-ISIS missions in order to focus on protecting Iraqi bases and coalition forces amid tensions with Iran, according to a US defense official and Iraqi security officials.

On Monday night, ISIS militants carried out attacks on an Iraqi security border post near the Syrian border, killing one officer and wounding four others. An ISIS militant was also killed after Iraqi security forces clashed with them. ISIS used light weapons to attack the border post about 45 kilometers north of the al-Walid border crossing with Syria, Iraqi officials said.

On Sunday, a number of ISIS militants attempted to attack another security post near the Syrian border but fled the scene after Iraqi security forces fired back, the Iraqi security officials added.

"ISIS group is well known for exploiting the situation. We knew the group will take advantage of current tension between America and Iran," Iraqi military Col. Shaker al-Raishawi said.

Al-Raishawi and another Iraqi security official told CNN from Anbar Province on Tuesday that ISIS has increased its activity in the border area.

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