The investigation into the alleged fixing of the key benchmark Libor rate was launched in 2012.
Barclays was fined £290m ($454m) in 2012 by British and US regulators.
Its previous fine was over the manipulation of Libor and Euribor interbank rates between 2005 and 2009.
Barclays chief executive Bob Diamond and chairman Marcus Agius resigned in 2012 after the scandal.
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