An American fighting for the Islamic State was killed over the weekend in Syria, US officials say, underlining growing concerns about Westerners signing up for extremist groups in the Middle East.
The US had been aware that Douglas McCain, 33, a one-time aspiring rapper and basketball fan from California, was in war-torn Syria, the White House said on Tuesday in confirming his death.
McCain, who converted from Christianity to Islam about a decade ago, was killed in fighting against the Al-Nusra Front, an al-Qaeda-linked group blacklisted by the US, media reports said.
"We continue to use every tool we possess to disrupt and dissuade individuals from travelling abroad for violent jihad and to track and engage those who return," National Security Council spokeswoman Caitlin Hayden said.
McCain's affiliation to Islamic State (IS) - which has overrun large swathes of Iraq and Syria in a brutal offensive - and his death had left his family "devastated" and "just as surprised as the country", his uncle, Ken McCain, told CNN.
He was "a good person, loved his family, loved his mother, loved his faith", the uncle said, referring to his nephew's Christian beliefs before his conversion.
The US State Department informed the family of his death on Monday.
Former classmates recalled McCain as a "goofball".
"Doug was a fun guy to be around. Played basketball, joked a lot .... Got along with most ... Wasn't the best athlete, but liked to play," a former friend told NBC News.
Friends said on Twitter that he converted to Islam around 2004.
NBC said McCain, from San Diego, was carrying about $US800 ($A865) in cash and his American passport when he was killed.
It cited an activist as saying McCain was among three foreign fighters in the IS camp who died during the battle, although details were sketchy.
On Facebook, he called himself "Duale ThaslaveofAllah" and his Twitter bio read "It's Islam over everything", according to NBC.
"The threat we are most concerned about to the homeland is that of fighters like this returning to the US and committing acts of terrorism," a senior Obama administration official told NBC.
US officials last week told AFP that more than 100 US nationals had left to fight in Syria or tried to do so, while more than 60 Australians and hundreds of Britons have also reportedly made the journey, along with those from other European countries.
The US State Department estimates there are about 12,000 foreign fighters from at least 50 countries in Syria.
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