One of the biggest banks in the United States, Citibank, has been criticised inan investigation into alleged money laundering.

The criticism is contained in a report by US officials on the movement of funds in the early 1990s belonging to Raul Salinas, brother of the former Mexican president.

The officials accuse Citibank of using various means to disguise the source of up to one hundred million dollars.

The report says Citibank broke its own rules but it stops short of alleging the bank broke the law.

The US Department of Justice is conducting a separate criminal inquiry into the affair.

A Citibank spokesman said the report contained errors of fact and interpretation.