The U.S.-led coalition told Reuters on Friday that it does not have "any releasable information concerning the whereabouts" of IS leader Abu Bakr al-Baghdadi.
The Syrian Observatory for Human Rights said on Friday that Islamic State has taken back control of half of the Syrian town of Albu Kamal.
Syria's army declared victory over Islamic State, saying its capture of the jihadists' last town in the country marked the collapse of their project in the region.
The Syrian army and its allies have taken Albu Kamal, Islamic State's last major stronghold in Syria.
Egypt Today briefs top stories for political issues.
Syrian army and allied forces have taken Albu Kamal, the last major town held by so-called Daesh in the country, pro-government sources said.
Syria's army and its allies, led in the battle by Lebanon's Hezbollah, have captured the last major Islamic State-held town in Syria.