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There are believed to have been many casualties in a day which started as a peaceful rally, and ended with running battles between police and demonstrators in which shots are said to have been fired.
The demonstrators are demanding that the former Prime Minister, Imre Nagy, be returned to power.
Mr Nagy was dismissed last year for his liberal policies, but has since been rehabilitated and was re-admitted to the Hungarian Workers' Party this month.
Other demands include free elections, freedom of the press, and a withdrawal of Soviet troops.
Declaration of independence
The uprising began as a rally in central Budapest, to express solidarity with Polish demonstrators who have recently succeeded in getting their deposed liberal leader, Wladyslaw Gomulka, returned to power.
The gathering turned into a mass demonstration for a similar Hungarian "declaration of independence" from Moscow's control.
As more and more people joined the demonstration, the First Secretary of the Hungarian Communist Party, Erno Gerö, made an unscheduled radio announcement, describing as "lies and rumours" reports that Hungary wanted to loosen its ties with the Soviet Union.
Mr Gerö is known for his hardline views, and tensions in Hungary have been high since he was appointed in July.
Immediately after the broadcast, the crowd marched on the broadcasting station.
The gathering was peaceful at first, but the crowd became restless and tried to force their way in.
They were driven back by security forces with tear gas and responded by throwing stones at the windows. One group drove a heavy lorry at the front door in an attempt to break it open.
The incident marked the start of an escalation of violence.
A running battle began to clear the crowd away from the building, while clashes between demonstrators and armed police broke out elsewhere in the city.
When the crowds refused to disperse despite police opening fire on them, Mr Gerö ordered Soviet tanks onto the streets.
The demonstrators, however, are showing no signs of giving up their protest, which is continuing into the night.
The Hungarian Communist Party met the same night in emergency session and re-instated Imre Nagy as prime minister.
Soviet tanks were still on the streets, however, and the uprising continued.
On 25 October, tanks opened fire on a crowd in Parliament Square at point-blank range.
Hundreds died and were wounded, and the Communist Party was so shocked by the incident that it sacked Erno Gerö, replacing him with Janos Kadar.
Soviet troops began pulling out of the Hungarian capital on 30 October. Mr Nagy formed a government which was dedicated to lifting the shackles of Soviet communism.
By 4 November, the Soviet leader, Nikita Khrushchev, sent in the tanks in a ruthless crackdown in which thousands died and another 200,000 fled the country.
Imre Nagy took refuge in the Yugoslav embassy but was abducted by Soviet agents. He was executed in 1958 after a secret trial in Budapest in which he was accused of high treason.
In 1989, he was officially rehabilitated and reburied with full honours.
Hungary remained under Soviet control until the collapse of communism in 1989.
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