Pakistan International Airline (PIA) Chairman on Thursday ordered high level inquiry to investigate causes resulting in recent congestion of PIA passengers in Saudi Arabia. The two-member inquiry committee comprising Director Administration Wasim Bari and Director Airport Services Colonel Ahsan Siddiqui (Retd) is leaving for Jeddah later on Thursday and will submit report within three days. A large number of people who had gone to Saudi Arabia to perform Umrah during Ramazan ul Mubarak were stranded at Jeddah airport as they could not get seats on PIA flights to return home to celebrate Eid ul Fitr.