Officials say a U.S. citizen has been killed in Syria while fighting alongside Kurdish forces to defeat ISIS.

The Associated Press reported that Keith Broomfield was likely the first American to die while fighting alongside the Kurds against ISIS.

State Department spokesperson Jeff Rathke confirmed today that Broomfield had died in Syria, but did not provide additional information.

“Out of respect for the privacy of Mr. Broomfield’s family, I don’t have any additional details to provide at this point,” he said.

Stay with Fox News for more information as this story develops.