Forty-six years to the day after the sinking of the Danish ocean liner MS Hans Hedtoft, Queen Margrethe II unveiled a memorial in Copenhagen to the 95 passengers and crew who perished.
The Troubles: On Bloody Sunday, members of the British Parachute Regiment shot 26 civil-rights protesters in Derry, Northern Ireland, killing at least 13 people.
Vietnam War: Forces of the Viet Cong and the Vietnamese People's Army launched the Tet Offensive to strike military and civilian command and control centers throughout South Vietnam.
Mahatma Gandhi (pictured), the political and spiritual leader of India and the Indian independence movement, was fatally shot by Nathuram Godse at Birla House in Delhi.