Airline spokesman Raju K.C. says the mouse is believed to have boarded the plane at the Katmandu airport Monday through a food catering truck.
He says the animal darted out of the pantry toward the back of the plane, where it remained unnoticed by the few passengers who had boarded. The cabin crew unsuccessfully hunted the mouse and then decided to cancel the flight and perform a more thorough search.
The airline spokesman says the plane will not be used again until the mouse is found.