During a two-minute silence for victims of war at the war memorial in Amsterdam, someone yelled an unintelligible remark which caused panic and confusion among the crowd.
More than 30 people were hurt, most of them trampled underfoot or falling against safety barriers, Prime Minister Jan Peter Balkenende said. Police detained two suspects.
Queen Beatrix reappeared shortly after the incident.
Just over a year ago the queen was the target of an attack on the April 30 Queen's Day national holiday when a Dutchman rammed his car into onlookers at a royal parade in the city of Apeldoorn, killing himself and seven others.
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New York Times