A week after the raid, President Barack Obama said bin Laden had a "support network" in Pakistan and the country must investigate how he evaded capture. Pakistan responded by announcing the formation of a committee to investigate bin Laden's presence in Pakistan as well as the circumstances surrounding the U.S. raid.

Soon after it began its work, the head of the committee said he was sure that security forces were not hiding bin Laden. Other statements since then have also suggested the report will be more of a whitewash than a genuine probe.

Last week, committee spokesman retired Col. Mohammad Irfan Naziri said its findings were being written up but they might not be released publicly.

"We're disappointed," said a U.S. official about the investigation. "They promised to do it, but they haven't yet."