A British bank has been accused of carrying out billions of dollars of transactions for funders of terrorist groups such as Hamas and al-Qaeda, according to US court documents.

Standard Chartered, one of the UK’s largest banks, is alleged to have carried out the deals worth more than $100bn from 2008 to 2013 in breach of sanctions against Iran.

The lender had avoided prosecution for money laundering by the US Department of Justice in 2012 when Lord Cameron’s government intervened on its behalf.

An independent expert has identified $9.6bn of foreign exchange transactions with individuals and companies designated by the US government as funding “terror groups”, including Hezbollah, Hamas, al-Qaeda and the Taliban, according to the BBC.

The bank disputed the claims put forward by whistleblowers, saying their previous allegations had been “thoroughly discredited” in the US.

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