the Tel Abyad attack , 14 Turkish F-16s patrolled the Turkish - Syrian border on Friday , Turkish military said . Xelil said some of the attackers infiltrated from the Turkish border to the north , reiterating accusations that Turkey was supporting the group . Turkey has consistently denied those accusations and the security sources said recent measures to stop illegal crossings meant it was impossible that the attackers had entered from Turkey .
REUTERS / Jorge Silva GENEVA The United States and Russia failed on Friday to reach a breakthrough deal on military cooperation and a nationwide cessation of hostilities in Syria , saying they still have issues to resolve before an agreement could be announced . U.S. Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov , addressingcontact.mediastatement.naa joint news conference after more than nine hours of off - and - on talks in Geneva , said teams from both sides would try to finalize details in coming days in the Swiss city . Kerry said the talks with Lavrov had " achieved clarity on the path forward " but together they offered few details on how they planned to renew a February cessation of hostilities and improve humanitarian assistance . " We do n't want to have a deal for the sake of the deal , " Kerry said .