(Bloomberg) -- Lloyds Banking Group Plc was hit by a cyber attack that disrupted online services for customers two weeks ago, a person with knowledge of the matter said, amid mounting concern over the threat hackers pose to major banks.

Britain’s largest mortgage lender was targeted by a denial-of-service attack, which aims to cripple an online system by flooding it with traffic, said the person who asked not to be identified because the details aren’t public. To defend its systems, Lloyds used geo-blocking tactics to prevent web requests from servers in locations used in the assault and scrubbing techniques to cleanse incoming data, the person added.

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