A hacking incident in Bangladesh last year has exposed the vulnerability of hundreds of banks in the world’s largest economy.

The Bangladesh National Bank (BNB), which is the country’s biggest, was one of the victims.

The country’s central bank said it has discovered the hack.

Bankers and other financial institutions in Bangladesh said they had not been targeted, and that they are not vulnerable to any cyberattack.

Bangladesh’s prime minister has said the hackers, identified by the initials Hacking Team, used the internet to launch attacks on banks and credit card companies.

The group has claimed responsibility for other hacks in the past.

The attacks began on December 10, when hackers stole personal data from the Bangladesh Bank and other banks in an attack dubbed the “BlackFriday” that affected around 10 million people.

Hacking team has claimed the attacks were in retaliation for a decision by the countrys central bank to freeze bank accounts.

The attackers used social engineering to recruit Bangladeshis and other foreigners to carry out the hack, the bank said in a statement.

It said they also took personal information from other companies and organisations, including the government, and used it to commit other cybercrimes.

The hackers, whose names were not revealed, also demanded ransom for the data.

“They stole data, they took photos, they stole passwords, they did the job,” Bangladesh Prime Minister Sheikh Hasina told reporters on Tuesday.

The BNB is the second-biggest lender in Bangladesh.

It was hit by a series of cyberattacks in 2016 that affected more than 300 million people and led to the suspension of thousands of bank accounts and the cancellation of nearly $100bn in payments to the central bank.

It is also Bangladesh’s biggest issuer of foreign currency.

Bangladesh was one the world leaders in tackling financial security issues in the face of global economic turmoil.

In December, the central government agreed to introduce a $500,000 payment to the country to help the government tackle the financial crisis.