WASHINGTON — The Office of Thrift Supervision was more focused on blocking the Federal Deposit Insurance Corp. from reining in Washington Mutual Inc. than it was in regulating the thrift company itself, congressional investigators and two watchdogs said Thursday.

A day before officials representing both agencies are scheduled to answer for the biggest failure in U.S. history, Sen. Carl Levin released a scathing report on Wamu's oversight, asserting that the OTS viewed the Seattle company as a "constituent," repeatedly ignored its own examiners' findings about Wamu's risky strategy and responded to the FDIC's more aggressive tone by fighting a turf war.

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