A Senate panel is said to be looking into warnings by a former trader at JPMorgan Chase (JPM) months before his bets ballooned into a $6 billion loss for the company.

Hesitation expressed by Bruno Iksil, whose outsize bets earned him the moniker the "London Whale," is among areas being examined by the Senate Permanent Subcommittee on Investigations, the Wall Street Journal reported late Thursday.

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