Thousands of Cubans gathered around the U.S. diplomatic office in Havana Tuesday, to demonstrate against what President Fidel Castro has called "provocations" from Washington.

The marchers are protesting an electronic message board posted on the side of the building that since last week has been displaying passages from the Universal Declaration of Human Rights and quotes from slain American civil rights leader, Martin Luther King.

Mr. Castro called for the march on Sunday during a speech on national television, accusing Washington of human rights violations in Iraq and Afghanistan.

Tuesday's march also was timed to coincide with the court appearance of Cuban exile Luis Posada Carriles, who is being held at a U.S. federal detention center on immigration charges. Cuba says the Bush administration is protecting Posada Carriles, who is wanted for his alleged role in the bombing of a Cuban airliner in 1976.

Some information for this report was provided by AFP, AP and Reuters.