A Jaguar fighter aircraft of Indian Air Force crashed in a forest near Lik in Upper Dzongu in North Sikkim on Friday.
Colonel Gurung of 27 Mountain Division stationed in North Sikkim told reporters that the fighter jet crashed at 1:15pm.
The aircraft had taken off from Bagdogra airport near Siliguri in West Bengal, Col Gurung said.
Army sources quoting eyewitnesses said Flight Lieutenant Yogesh Yadav, who was flying the aircraft, had bailed out.
Yadav has reportedly been rescued and rushed to a hospital.
Rescue helicopter from Bagdogra has left for the spot.
According to eyewitness accounts, there was a loud bang before the plane crashed and the pilot ejected from the aircraft.