A K2 Airways Boeing 737-400 cargo aircraft en route from Sharjah, United Arab Emirates, to Karachi, Pakistan, disappeared from radar over the Arabian Sea, about 300 kilometers west of Karachi, late on Tuesday night, Dawn newspaper reports Wednesday.

According to reports, the aircraft lost contact about 300 kilometers west of Karachi while approaching Pakistani airspace.

There were five crew members on board the aircraft, the Pakistan Airports Authority said.

The pilot had reported a navigation problem during the flight and requested assistance from the area control center.