US President Barack Obama on Tuesday said it was not possible to know how long US-led operations against Islamic State militants in Syria and Iraq will last as the US military launched the first strikes against the militant group in Syria.
In a letter to Congress following the air strikes, Obama said: "It is not possible to know the duration of these deployments and operations. I will continue to direct such additional measures as necessary to protect and secure US citizens and our interests against the threat posed by ISIL," using another name for Islamic State.
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