Flight PK-388 aircraft B-737 Reg.Mks.AP-BCD from Lahore to Islamabad attempted to land on Runway 12 but had to go around due to poor vis ty and heavy rain. The aircraft made second approach and managedto land on Runway 12. However after landing, the aircraft could not stop on the runway. It crossed the runway and finally came to a halt in the Kutcha 120' from the end of the stopway and 30 feet off set to the north of extended Runway centre line.