Pakistan has reportedly given China access to the stealth chopper that crashed during the raid that killed Osama bin Laden, despite the CIA's requests not to. One of the two Blackhawk helicopters used during the raid malfunctioned before crashing and forcing the commandos to abandon it. The aircraft is believed to have special "stealth" capabilities that allow it to travel while evading radar detection. The ISI, Pakistan's top spy agency, is believed to have been behind the decision, but has denied the report. The group allegedly allowed Chinese officials to photograph the crashed copter and take samples of its shell that allows it to evade radar detection.