The investor group that led a $7 billion capital injection into struggling Washington Mutual Inc. in April waived its right Wednesday to extra compensation should the thrift company try to raise more capital or pursue a sale.

Wamu, badly bruised by mortgage losses, has posted three straight quarterly losses. After ousting long-time chief executive Kerry Killinger and replacing him last week with Alan Fishman, sources close to the company said Wamu began a search for a buyer late last week.

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