Treasury Department officials acknowledged Tuesday that new data on loan modifications showed that many servicers are underperforming in trying to carry out the Obama administration's foreclosure prevention plan, but they appeared to have little leeway to force improvements.

For the first time, a report detailed how individual institutions were faring: Bank of America Corp. and Wells Fargo & Co. were listed among the worst performers; JPMorgan Chase & Co. had one of the highest rates for helping eligible borrowers.

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