By Tom Bergin LONDON (Reuters) - The world's biggest central banks have told regulators that banks must tighten security around their SWIFT messaging systems following the theft of $81 million from Bangladesh's central bank in February. The SWIFT Oversight Forum, a group of 10 of the biggest central banks, led by the National Bank of Belgium (NBB), has sent an update to bank regulators urging them to scrutinize banks' procedures, according to an undated document recently published on the NBB website. Thieves hacked into Bangladesh Bank's SWIFT system in February and sent fraudulent payment instructions to the New York Federal Reserve in an attempt to steal $1 billion.
