WASHINGTON — The Office of Thrift Supervision improperly allowed the backdating of capital infusions for six thrifts, according to a report released Thursday by the Treasury Department's Office of Inspector General.

The report is sharply critical of the agency, saying the backdating allowed the thrifts to appear in better condition than they really were. It named only one thrift - IndyMac Bancorp., which failed last year - but sources have identified Florida-based BankUnited as another institution where backdating occurred. The identities of the other four thrifts are unknown.

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