Hungary is holding events to mark the 50th anniversary of the uprising against Soviet rule, despite bitter domestic political divisions.
Some veterans of the uprising have refused to shake hands with Prime Minister Ferenc Gyurcsany.
A former communist youth leader, Mr Gyurcsany is mired in controversy after admitting he lied to win re-election.
President Laszlo Solyom spoke at a ceremony on Sunday, calling for national unity.
He said the entire nation shared the demand for Hungarian independence during the uprising, which was suppressed in a bloody intervention by Soviet forces.
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