The death of Maulvi Nazir could prove to be a contentious issue between Washington and Islamabad, which is believed to have struck a non-aggression pact with Nazir.
Senate report cites changes made by intelligence agencies, including the FBI and the CIA, in its probe of the origin of confusing explanations that came from the Obama administration.
Celebrations were planned around the world, including the traditional crystal ball drop in New York City's Times Square, where 1 million people were expected to cram into the surrounding streets.