Kweku Adoboli, 32, is accused of gambling away £1.4 billion while working for Swiss bank UBS during the global financial crisis.
At one point he was at risk of causing the bank losses of $12bn (£7.5bn), jurors at Southwark Crown Court were told.
An alleged rogue trader accused of Britain's biggest fraud wept as he told a jury he was trying to cover millions of pounds worth of losses incurred at the bank he called his "family".
Kweku Adoboli, 32, is accused of gambling away £1.4 billion while working for Swiss bank UBS during the global financial crisis.
At one point he was at risk of causing the bank losses of $12bn (£7.5bn), jurors at Southwark Crown Court were told.
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