The explosion that killed an American and a British special operator in Syria last year was caused by coalition forces accidentally and not an enemy, as the Pentagon originally said, U.S. Special Operations Command has determined.

Army Master Sgt. Matthew Dunbar, 36, and British Sgt. Matthew Tonroe, 33, were killed by the accidental detonation of explosives carried by one of their team members, according to a SOCOM statement Monday that confirmed the findings of a British investigation.

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