A civil aviation official has said there were (difficult) weather conditions at the time of the crash. There was torrential (rain) and heavy mist in the area. Images from Pakistani (television) show smoke rising from the spot where the (plane) came down.The flight originated in Turkey. Police said it was an Airblue (flight) to Islamabad via Karachi with more than 150 people on (board). The company operates flights (domestically) as well as to Britain and to the Gulf.The aircraft crashed to the (north) of Islamabad. The plane is said to have lost contact with the control (tower) minutes before landing. A huge rescue operation has been (launched), but it's being hampered by the poor (weather) conditions.Helen Fawkes, BBC News