An American, Douglas McAuthur McCain, was killed over the weekend fighting for the Islamic State in Iraq and Syria (ISIS).
“We were aware of U.S. Citizen Douglas McAuthur McCain’s presence in Syria and can confirm his death,” National Security Council spokeswoman Caitlin Hayden confirmed in a statement.
McCain, 33, of San Diego, was one of three foreign jihadis fighting with ISIS who died during a recent battle, the Free Syrian Army told NBC.
McCain identified himself as "Duale ThaslaveofAllah" on his Facebook page, and his Twitter bio read: "It's Islam over everything," the report said.
U.S. officials have warned that a number of Americans are fighting with ISIS in Iraq and Syria, but have not given an exact count.
McCain's death could increase concerns that such Americans could come back to the U.S. and launch an attack on the homeland.
U.S. officials have said in recent days that ISIS is currently more of a regional threat than one to the homeland itself, but noted that that could change quickly.
House Intelligence Committee Chairman Mike Rogers (R-Mich.) said on NBC Sunday that ISIS is just "one plane ticket away from U.S. shores."
“We know the [Obama administration’s] number 2,000 ... with Western passports is low,” he said. “Intelligence has a very different number and it’s much higher than that," he said.
Justin Sink contributed.
This story was updated at 6:49 p.m.