(CNN) - ISIS beheaded another Westerner, a British aid worker. U.S. Secretary of State John Kerry courted Middle Eastern leaders to join a coalition in the fight against the Islamist militants. And U.S. planes aimed at ISIS flighters near Iraq's capital.

As world leaders struggled Monday to come up with strategies against ISIS just days after a high-profile beheading by the Islamist militants, the U.S. military targeted an ISIS position near Baghdad.

An airstrike southwest of the city appears to be the closest the U.S. airstrikes have come to the Iraqi capital since the start of the campaign against the Islamist militants, a senior U.S. military official told CNN.

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