Ex UBS bosses accused of "staggering" ignorance

UBS was fined a record $1.5 billion last month for manipulating Libor interest rates, the latest in a string of scandals including a $2.3 billion rogue-trading loss and a tax avoidance row with the United States that have shredded the group's once venerable reputation.

Four former UBS executives, including ex-chief executive Marcel Rohner, told a British parliamentary panel investigating banking standards that the first they heard of the bank's involvement in rigging Libor was from press reports in 2011.

All of them had been in charge of the investment banking unit for part of the period when the manipulation, stretching back to 2005, occurred.

"The level of ignorance seems staggering to the point of incredulity," said Andrew Tyrie, the head of the Parliamentary Commission on Banking Standards (PCBS), which was set up in the aftermath of the Libor scandal.

Rohner said he was "shocked" and "ashamed" when he read about the rigging, but he said during his period as CEO he was trying to save the bank from collapse and was unaware of the misconduct. He denied his leadership had been negligent.

"The times I was leading this institution were so extreme I was fighting permanently for survival," said the Swiss national. "I did the best I could."

Rohner was CEO for 20 turbulent months between 2007 and 2009, when UBS repeatedly had to tap shareholders for cash as it was forced to

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