"No more governments of thieves and the corrupt," read some placards as the crowd moved through the centre of the capital to the Congress building yesterday.
"The goal of the march is to demand that all those corrupt in all the parties and businessmen are investigated, so they return the money and go to jail," Saul Mendez, a leader of the Suntracs construction union that was among the organisers, told AFP.
The scandal surrounding the Brazilian company Odebrecht, which US authorities said paid USD 59 million in bribes in Panama between 2010 and 2014, was just "the tip of the iceberg," he said.
Panama, which is trying to clean up its image after the Panama Papers scandal last year, has asked Interpol to issue wanted alerts for the sons of Ricardo Martinelli, who was president who was president at the time.
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