(Bloomberg) -- William Steward, a former accountant in product control for UBS AG, said he began looking into trades by Kweku Adoboli in August 2011 after receiving a report of a $3.57 billion discrepancy.

Steward spent the next several weeks trying to clarify the discrepancy and received explanations from Adoboli that he had used "a shortcut while he was under pressure for time," rather than booking every trade.

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