The former Interior Minister of Croatia, Josip Boljkovac, has been arrested over his involvement in war crimes committed during and after the Second World War.
Croatian Police arrested the 89 year old in the central town of Karlovac on Wednesday.
89 year old Boljkovac fought alongside communist partisan resistance fighters, when the country was ruled by the pro-Nazi Ustasha movement.
After the war, he was part of the secret police of the new communist government. It is in this capacity he is thought to have been involved in the killings of fascist Ustasha supporters.
Over 30,000 pro-Ustasha Croatians were killed in revenge attacks after the communists came to power.