1980 Camarate plane crash

The 1980 Camarate air crash occurred on 4 December 1980 when a small private aircraft carrying Portuguese Prime Minister Francisco de Sá Carneiro and Defense Minister Adelino Amaro da Costa crashed in Camarate, Lisbon, Portugal. Initial investigations concluded the incident was due to crew fatigue and incompetence, but later parliamentary investigations found evidence of a bomb beneath the cockpit.

Source: Wikipedia — 1980 Camarate plane crash (CC BY-SA 4.0)