Dahud Hanid Ortiz, a former U.S. Marine convicted of a triple homicide in Spain, was among 10 Americans repatriated in exchange for 250 Venezuelans held in El Salvador.

Forty-eight Venezuelans detained by their own government have so far been released under the terms of a prisoner exchange agreed with the United States, legal rights advocacy group Foro Penal said on Monday.

But one of those men is an American-Venezuelan dual citizen who was convicted of murdering three people in Spain in 2016, according to Venezuelan court records and statements from officials in Madrid.