Apparently PIA Boeing 777-200ER (AP-BHX) flight from Bujumbura landed at Jeddah Airport at 12:10 AM on September 7.
Later, AP-BHX departed from Jeddah at 1:59 AM as flight PK-8001 to Islamabad where it landed at 8:30 AM. Maybe the Boeing 777 was refueled at Jeddah?

Source:
flightradar24.com
Information about Jeddah to Islamabad PIA flight PK-8001 on Islamabad International Airport website.

Source:
islamabadairport.com.pk
Abbas