Ransom (movie, 1974)

Following a series of bomb attacks in London, a group of terrorists seize Britain's ambassador to Scandinavia. With the ambassador now a hostage in his residence, another group hijacks an airliner at the capital's airport, announcing that the passengers will not be freed until their demands are met. Colonel Nils Tahlvik, Scandinavia's resourceful and ruthless head of security, seeks to take an uncompromising stance against the terrorists yet his attempts meet resistance from unknown forces at every turn...