An arrest warrant has been issued in the Bhutto assassination

Arrest warrant issued for former Pakistani President Musharraf

Late last year, Pakistani authorities arrested two police officials in the case.

A United Nations panel looking into Bhutto's assassination concluded that Pakistan's military-led former government failed to adequately protect her and that intelligence agencies hindered the subsequent investigation.

The panel's scathing report in April 2010 said the suicide bombing that killed Bhutto "could have been prevented" and that police deliberately failed to pursue an effective investigation into the killings.