A Spanish judge has jailed former Argentine naval officer Ricardo Miguel Cavallo without bail on charges of genocide and terrorism for crimes that occurred during Argentina’s military dictatorship. Cavallo was extradited from Mexico to Spain.

Cavallo is accused of kidnapping, torturing and murdering hundreds of people. All told as many as 30,000 people were killed or disappeared under Argentina’s military dictatorship that lasted from 1976 and 1983.