An American trainer working with Saudi Arabia’s National Guard was killed on Thursday in a helicopter crash in Riyadh in the course of a routine activity, a statement published by state media said.

The Saudi statement gave the trainer’s name as Paul Reidy and did not say whether he was a member of the military or a civilian. A U.S. Army official confirmed there had been a military fatality without providing details.

Investigators were still trying to determine the cause of the incident.