1966: Viet Cong bombs Saigon
At least eight people have been killed and several wounded after Viet Cong artillery shelled the South Vietnamese capital, Saigon.
Altogether about 30 shells were fired into the city centre.
The first round came as troops and spectators were getting ready to watch a parade to mark National Day, the third anniversary of the overthrow and assassination of former Prime Minister Ngo Dinh Diem.
There was a lull and then a second round of shells exploded as Prime Minister Nguyen Kao Ky was saluting his troops.
American officer killed
There was chaos as crowds tried to find cover on foot or by motor scooter.
Many found their way blocked by American and South Vietnamese armoured vehicles coming from the opposite direction.
One shell hit the Chapel of Saint Anthony of Padua in the cathedral.
And another exploded just outside the cathedral killing an American officer.
Five other Americans were wounded and at least two Vietnamese killed when a shell hit the crowded central market.
The Viet Cong were firing from bases at the edge of the jungle some three and half miles away from Saigon and amazed military observers with their accuracy.
They also sank an American minesweeper in the Saigon River with a mine later in the day, killing several crew members.
Call for more US troops
So far US armed helicopters and South Vietnamese ground forces have failed to track down any Viet Cong bases.
Yesterday, former US President General Dwight D Eisenhower called for more troops to be sent to Vietnam to bring about a swift end to the conflict.
He told the US News and World Report that the war had been "going on too long" and said America should be "putting in the kind of military strength we need to win" as soon as possible.