Uber failed to tell UK authorities of mass data breach, says No 10

Taxi-hailing firm warned it may face higher fines as inquiry continues into whether UK customers' details were compromised

UK authorities were unaware of a mass data breach at Uber that potentially put British customers' personal details into the hands of cyber criminals.

Downing Street said the hack, which affected 57 million customers and drivers worldwide, had not been reported by the taxi-hailing firm.