A former Argentine police officer accused of human rights violations during military rule has been arrested in Spain on an international warrant.
Some 30,000 people may have been killed during the 'dirty war'
Spanish authorities identified the suspect as 63-year-old Ricardo Taddei.
He is wanted in Argentina in connection with the kidnapping and torture of more than 160 leftist dissidents at the time of the 1976-83 military junta.
The Spanish authorities said he worked in clandestine detention centres between 1976 and 1979.
The abuse allegations date from this period.
Human rights groups say up to 30,000 political opponents of the regime were kidnapped, detained and later executed during Argentina's "dirty war".
In April 2005, a former Argentine naval officer, Adolfo Scilingo, was convicted in Spain of crimes against humanity and given 640 years in prison.