Junaid Amin, the head of Pakistan's Civil Aviation Authority, said the plane's voice and the flight data recorders have been found at the crash site. He says the analysis of the data and completing the crash investigation could take several months.

Amin said the items will be sent to Germany or France since Pakistan doesn't have facilities to perform the analyses.

The Airblue plane was headed to Islamabad from the sea port city of Karachi on July 28 when it crashed in a hillside while trying to land.

Pakistan observed a day of mourning a day later for victims of the accident - the worst passenger plane crash on Pakistani soil.

Officials do not know if weather played a factor in the crash. Pakistan is in the midst of the annual monsoon season, when rain sweeps across the subcontinent from June until September.

The Airbus A321 was carrying 146 passengers and six crew members, the airline said. The U.S. Embassy in Pakistan said two of the people aboard were American citizens.