"The US citizen is being legally detained by Department of Defense personnel as a known enemy combatant", Rankine-Galloway stated.
Brown said the American was taken into custody on or before Tuesday by Syrian Democratic Forces, a US -backed alliance of Kurdish and Arab militia fighters in Syria.
The spokesperson for the coalition tweeted on Tuesday that "SDF hold more than 60 percent of Raqqa; 35 blocks cleared of ISIS this week".
The US military command said they were aware of the report. Earl Brown, told the Daily Beast. Their home countries will be contacted for the next steps.
An ISIS convoy that had been stranded in the Syrian desert for two weeks reached militant-held territory in eastern Syria on Wednesday after a US -led coalition stopped airstrikes on its route following a request from Russian Federation.
Premier League clubs vote to close transfer window before the season starts
The January transfer window remains unaffected. "Now we have to extend the discussion to a European level". The window closed last Thursday, three weeks after the new season had started.
On Thursday, the chief spokesman for the United States military command referred all questions about the news.
U.S. officials reportedly confirmed that there are around 250 Americans who left the country to join the ISIS cells in Syria and Iraq, but there are no details about how many are still left fighting for the organization.
The unnamed man is not the first American seized for participating in combat for ISIS. The Islamist militant group had taken control of large parts of the two Middle East nations in 2014 to establish an Islamic caliphate, but they have been driven out of their strongholds in both the countries following months long offensive launched by local forces and an anti-Isis US-led coalition group.
Although Dillon said he was unaware of other incidents of Americans being captured, Mohamad Jamal Khweis, 27, of Virginia, was indicted last November on charges of aiding terrorism after he was captured in Iraq.