Initially, it was believed that Delta Force Master Sergeant Jonathan Dunbar and SAS commando Sgt. Matt Tonroe were killed by an ISIS-placed improvised explosive device while on an operation looking for high-value targets in northern Syria. The deaths occurred in March 2018.
US Special Operations Command validated a report from the UK Ministry of Defense, revealing the earlier account of US Army Master Sgt. Jonathan J. Dunbar’s death in a Syria raid was incorrect. It is now confirmed that Dunbar and Tonroe of the Special Air Service Regiment were killed by the unintentional explosion of coalition forces’ own explosives.
Five other soldiers were injured in the incident.