Seven personnel were aboard a U.S. military  American HH-60 Pave Hawk helicopter that crashed in Western Iraq on Thursday, resulting in several casualties according to reports.

A U.S. official told ABC News that the helicopter went down near the border of Syria and “some” of the passengers have died.

The Washington Examiner reports: The official said that there was no indication of hostile fire, but the possibility hasn’t yet been dismissed.

The coalition to combat Islamic State, Combined Joint Task Force-Operation Inherent Resolve, said they were aware of the crash and there would be an investigation.

“A U.S military aircraft has crashed in western Iraq with U.S. service members aboard. Rescue teams are responding to the scene of the downed aircraft at this time. Further details will be released when available,” the coalition said in a statement. “An investigation will be initiated to determine the cause of the incident.”

ABC News reports that this crash is “believed to be the first fatal helicopter crash in Iraq since the U.S. began fighting ISIS there in 2014.”

This story is still developing.