Syrian rebels backed by Turkish special forces, tanks and warplanes entered one of Islamic State's last strongholds on the Turkish-Syrian border on Wednesday, in Turkey's first major U.S.-backed incursion into its southern neighbor.
A column of at least nine Turkish tanks crossed into Syria with the group of largely Arab and Turkmen rebels to drive Islamic State out of Jarablus and surrounding villages. A Reuters reporter at the border witnessed intense bombardments, with palls of black smoke rising around the town.
President Tayyip Erdogan said the operation was targeting both Islamic State and the Kurdish YPG militia, whose gains in northern Syria have alarmed Turkey. Ankara views the YPG as an extension of Kurdish militants fighting an insurgency on its own soil, putting it at odds with Washington, which sees the group as an ally in the fight against Islamic State.
"Whether it's Daesh (Islamic State) or the YPG, they are all terrorist organizations," Erdogan told a joint briefing in Ankara after meeting U.S. Vice President Joe Biden.
"A terrorist organization fighting another terrorist organization doesn't make it innocent," he said, adding that Islamic State had been forced out of Jarablus and that the town was now under control of the Syrian rebels.
Biden, who flew into Turkey, a key NATO ally with the alliance's second biggest armed forces, on a pre-planned trip hours after the operation began, tried to soothe Turkish concerns about Kurdish territorial gains in Syria.
"No (Kurdish) corridor. Period. No separate entity on the Turkish border. A united Syria," he told an earlier news conference with Turkish Prime Minister Binali Yildirim.
Biden said Washington had made clear to Kurdish militia fighters that they should return east of the Euphrates river again - a red line for Turkey - after helping to capture the city of Manbij south of Jarablus from Islamic State this month.
"They cannot, will not, and under no circumstances get American support if they do not keep that commitment," he said.
The offensive, dubbed "Euphrates Shield", is Turkey's first major military operation since a failed July 15 coup shook confidence in its ability to step up the fight against Islamic State. It came four days after a suicide bomber suspected of links to the group killed 54 people at a wedding in the southeastern city of Gaziantep.
A U.S. defense official said both A-10 "Warthog" ground attack aircraft and F-16 fighter jets were carrying out strikes in support of the operation.
Syria's foreign ministry condemned what it said was a breach of its sovereignty and accused Ankara of launching the incursion to replace Islamic State with "other terrorist groups". Russia, which backs Syrian President Bashar al-Assad, said it was deeply worried by the escalation of tension after Turkey's move.
A rebel commander with the Failaq al Sham group, who requested anonymity, told Reuters that most of the Islamic State insurgents in Jarablus had withdrawn, some of them surrendering. A second rebel commander estimated up to 50 percent of the town was now under control of the Turkish-backed rebels.
"Daesh fighters have withdrawn from several villages on the outskirts of Jarablus and are heading south towards the city of al Bab," the Failaq al Sham commander said.
Many of the rebels were from Jarablus itself and were jubilant over what they saw as a long overdue intervention. Amateur video footage from one rebel source seen by Reuters showed little sign of heavy fighting in the town center, suggesting Islamic State had pulled out with little resistance. Reuters could not independently authenticate the video.
Biden's visit comes at a testing time for Turkish-U.S. relations. Erdogan wants the United States to extradite Fethullah Gulen, a Turkish cleric who has lived in self-imposed exile in Pennsylvania for 17 years and whose religious movement he blames for staging last month's failed coup.
Washington says it needs clear evidence of Gulen's involvement and that it is a matter for the courts, a position that has sparked an outpouring of anti-Americanism from Turkey's pro-government media. Gulen denies any role in the coup attempt.
"For us the priority is the extradition of Gulen as soon as possible. They are talking about a court decision... but the agreement between the United States and Turkey requires the detention of such people. This individual continues to manage a terrorist organization from where he is," Erdogan said.
Biden said that while it may be difficult for Turks to understand, President Barack Obama had no constitutional authority to extradite the cleric. But Washington has more lawyers working on the extradition question than in any other such case in recent history, he said.
Despite their differences, Turkey and the United States hope that by removing Islamic State from the border, they can deprive it of a smuggling route used to swell its ranks with foreign fighters and its coffers through illicit trade.
"Euphrates Shield" was the first time Turkish warplanes have struck in Syria since November, when Turkey downed a Russian jet near the border, and the first significant incursion by Turkish special forces since a brief operation to relocate the tomb of Suleyman Shah, a revered Ottoman figure, in February 2015.
But for Turkey, it also pre-empts any attempt by Syrian Kurdish militia, who play a critical part of the U.S.-backed campaign against Islamic State, to take Jarablus.
Kurdish forces have captured large areas of territory since the start of the Syrian conflict in 2011, and Ankara has long declared the Euphrates river, which runs just east of Jarablus, a red line which it does not want them to cross.
Foreign Minister Mevlut Cavusoglu said Kurdish fighters must return east of the river or Turkey would "do what is necessary". He said the operation was a turning point and would accelerate the ousting of Islamic State from Syria's Aleppo region.
© 2016 Thomson Reuters. All rights reserved.
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