Sadiq Khan of Britain's opposition Labour Party was sworn in as Mayor of London on Saturday, becoming the first Muslim to head a major European capital after an election campaign marked by the ruling Conservatives' efforts to link him to extremism.

The son of a Pakistani immigrant bus driver and a seamstress, Khan defeated Conservative candidate Zac Goldsmith, the son of a billionaire financier, by a record margin to secure the biggest individual mandate in British political history.

The Financial Times said the result highlighted London's tolerance, a "remarkable triumph over the racial and religious tensions that have bedevilled other European capitals".

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