MUSCAT: A Pakistan International Airlines (PIA) passenger plane with about 70 people on board crash-landed on the runway of Omanâ€™s main airport in Muscat on Monday, forcing the cancellation of all flights from the facility, a safety officer said on Monday. Ali Al Zuwaidi, flight safety director at Muscat International Airport, said the pilot had reported no injuries among the passengers or crew. â€œA PIA aircraft crashed on the runway after its landing gear collapsed,â€ Zuwaidi told Reuters. â€œWe had to close the airport indefinitely until the investigation has been completed,â€ he added. Zuwaidi said the scheduled flight by the Boeing 737 aircraft was arriving from Islamabad when it crash-landed. Muscat airport is undergoing a $7.4 billon extension to expand its runway and terminal building.