(Bloomberg) -- Kweku Adoboli's co-workers knew he was making fictitious trades, the former UBS AG banker told an attorney who interviewed him on the night of his arrest in September 2011.

Adoboli told Damien Byrne Hill, a lawyer at Herbert Smith LLP who represented the Swiss bank, that his colleagues on the exchange-traded funds were aware of fictitious trades from May, though they didn't know the extent of his positions.

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