A coalition official said Brett McGurk was joined by British and French officials in Kobani, where Kurdish forces aided by US-led airstrikes drove back IS militants a year ago, handing the extremists one of their biggest defeats.
The official spoke to The Associated Press on condition of anonymity because he was not authorized to brief media. McGurk, in a series of Tweets, said the visit was meant to assess progress in the campaign against IS and discuss the next steps in the Syria campaign with "battle tested" and multi-ethnic anti-IS fighters.
"ISIL terrorists do not stand a chance in the face of the resilient people of Kobani, Tikrit, Ramadi, and soon Raqqa and Mosul," he posted.
The battle for the Syrian border town of Kobani was a watershed in the war against the Islamic State group. Syrian Kurdish forces fought the militants in rubble-strewn streets for months as US aircraft pounded the extremists from the skies.
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The town became the centerpiece of the campaign against IS as dozens of TV crews flocked to the Turkish side of the border and from a hill, trained their cameras on the besieged town, recording plumes of smoke rising from explosions as the US-led coalition pounded IS hideouts inside the town.
A US official said McGurk met with a coalition of Arab and Kurdish commanders while in northern Syria. The group, known as the Syrian Democratic Forces, has the backing of the US and has emerged as the biggest fighting force against IS in northern Syria.
The US administration has sent a few dozen special operations forces to northern Syria to support it.