(Bloomberg) -- HSBC Holdings Plc said a cyber attack temporarily shut down its Internet banking on Friday, the second time the bank’s online services have been disrupted in the U.K. this month.

The so-called denial of service attack, which aims to cripple an online system by flooding it with traffic, was “successfully defended,” the bank said in an e-mailed statement. Customers had taken to Twitter, saying they were unable to access their personal and business accounts on the final business day of the month, when British salaries are typically paid.

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