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 Ger, replacing him with Janos Kadar.
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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.
When the crowds refused to disperse despite police opening fire on them, Mr Ger ordered Soviet tanks onto the streets.