Violence has been unrelenting in Iraq and the suicide bombing in Baghdad was among a series of attacks tempering U.S. claims of success in taming the capital just days before a pivotal progress report is due to be delivered to the U.S. Congress by the top commander in Iraq Gen. David Petraeus and U.S. Ambassador Ryan Crocker.
Petraeus acknowledged the difficulties in a letter to U.S. forces on Friday summarizing the results of the troop increase U.S. President George W. Bush ordered last winter.
"It has not worked out as we had hoped," he wrote, offering a preview of what he planned to tell U.S. legislators in hearings that begin Monday amid a fierce debate over whether President Bush should begin withdrawing troops from Iraq.
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