Tesco Bank was hacked in November, with money stolen from 20,000 customer accounts. All online transactions were suspended at the time.
The bank, which has more than 7 million customers, confirmed that around 40,000 accounts saw "suspicious transactions" over the weekend, of which half had money taken.
"As a precautionary measure, we have taken the decision today to temporarily stop online transactions from current accounts. This will only affect current account customers," Higgins said.
"While online transactions will not be available, current account customers will still be able to use their cards for cash withdrawals, chip and pin payments, and all existing bill payments and direct debits will continue as normal. We are working hard to resume normal service on current accounts as soon as possible."
However, the Financial Conduct Authority said banks must refund unauthorised payments immediately, unless they have evidence that the customer was at fault or the payment was more than 13 months ago.
And that concludes Computing's look at security in 2016. Stay safe in 2017!
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