Hong Kong authorities on Friday condemned a British government call for the removal of a China-imposed national security law that Britain said had been used to persecute, "silence and discredit" pro-democracy opposition figures. Britain's Foreign Secretary James Cleverly wrote in his government's latest six-monthly report on Hong Kong that he had highlighted at a U.N. hearing in February how Hong Kong authorities had used the security law to crack down on opposition figures, many of whom are in jail or have been forced into exile. Cleverly called on Beijing to implement recommendations made in an independent U.N. Human Rights Council