Barclays Bank PLC lost $427.5 million dollars in the United States in the first half of this year, versus an $82.5 million loss a year earlier, the bank said Thursday.

The London-based bank attributed the loss to substantially higher provisions for nonperforming property loans and to $90 million in losses at its home-lending unit, Barclays American/Mortgage. The value of the unit's purchased mortgage servicing rights declined because of heavy loan prepayments.

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