The payment was reversed several hours later and no funds ever left the bank

Citi’s analysis, a portion of which was seen by Reuters and has not been previously reported, shows the bank has been grappling with a shortage of skilled personnel, finding at times that it did not have the right training and assessment tools to fix its regulatory challenges.

The rule is meant to protect depositors whose money is insured up to $250,000 by the government.

Telenor, the Norwegian telecommunications giant, has initiated its plan to sell its operations in Pakistan.

Five of the world's largest banks are to pay fines totalling $5.7bn (£3.6bn) for manipulating the foreign exchange market, US officials say.