A Hezbollah-run media unit said on Friday the ISIS leader Abu Bakr al-Baghdadi was reported to have been in the Syrian town of Albu Kamal during the Syrian army and its allies’ operation to clear it.
The military unit did not say what had happened to Baghdadi, give further details or identify its sources.
The US-led coalition against ISIS said on Friday said it had no “releasable information” on Baghdadi’s whereabouts.
Syria’s army declares victory
Syria’s army declared victory over ISIS on Thursday, saying its capture of the militants' last town in the country marked the collapse of their three-year rule in the region.
But the army and its allies are still fighting ISIS in desert areas close to Albu Kamal near the border with Iraq, the Syrian army said on Thursday.
On Friday, the Syrian Observatory for Human Rights said ISIS has taken back control of half of Albu Kamal.
The capture of the border town had sealed “the fall of the terrorist Daesh organisation’s project in the region”, an army statement said on Thursday, using the Arabic acronym for ISIS.
An audio message purported to be from Baghdadi was released in September.