Muscat - A PIA plane with about 70 people on board crash-landed on the runway of Oman's main airport in Muscat on Monday, forcing the cancellation of all flights from the facility. Ali Al Zuwaidi, flight safety director at Muscat Airport, said the pilot had reported no injuries among the passengers or crew. "The  aircraft crashed after its landing gear collapsed," he said. Flight by the Boeing 737 arrived from Islamabad.