Tesco Bank has taken the drastic measure of temporarily halting all online transactions after thousands of customers have seen hundreds of pounds wiped from their savings accounts over the weekend due to an online hacking attack.
Benny Higgins, chief executive of Tesco Bank, on Monday, confirmed that that about 20,000 customers have had money taken from their accounts, with "suspicious activity" identified in another 20,000.
The total is considerably more than the figure the bank was quoting on Sunday of fewer than 10,000 accounts.
The bank has now suspended online transactions for current account holders.
Customers affected by the block will still be able to withdraw cash and use other services.
On Twitter customers reported seeing as much as £700 disappearing from their available balance.
Others complained about a lack of communication from the bank and hours spent on hold.
Higgins said the bank is "taking every step to protect" customers.
Speaking to the BBC, Higgins sought to reassure customers saying he was "very hopeful" customers would be refunded within 24 hours.
Higgins said: "That is why, 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."
"We continue to work with the authorities and regulators to address the fraud and will keep our customers informed through regular updates on our website, Twitter, and direct communication," Higgins added.
The bank, which has more than 7 million customers account confirmed "fraudulent criminal activity" was first identified late on Saturday.
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