There was no need to alert the Russians using the demilitarization line over Syria, the official said. Two weeks ago, the US-led coalition arrested a senior ISIS leader in Aleppo, northern Syria, east of Monday. The United States has identified the detainee as Hani Ahmed al-Kurdi, an experienced bomb maker who became one of ISIS ‘top leaders in Syria. The United States has said it was “responsible for coordinating terrorist activities throughout the region.”