British bank Barclays Group PLC revealed on Tuesday credit-related losses totaling 1.6 billion pounds ( $ 3.13 billion ) , up from a smaller write-down in November , while Credit Suisse , Switzerland 's second-largest bank , said it has suspended " a handful " of traders in connection with the overvaluation of asset-backed securities by $ 2.85 billion ( 1.95 billion euros ) .