An Indian Air Force chopper crashed and plunged on Friday into Chenab river in Doda district.
Casualties are feared in the mishap, Deputy Commissioner Sharifudeen said.
The IAF chopper, which was on a regular sortie, was flying low over the river Chenab when it got caught in a cable wire of a bridge and crashed into the water reservoir of the Baglihar hydro-electric power project at Tringel in Doda district.
It was returning from Nawapachi area of Kishtawar district.
The exact number on board the chopper is not known as the chopper has sunk in the water body.
A rescue operation has been launched by the army and police, he said.
IAF carries regular sorties to mountain-locked Nawapachi area to transport ration, arms and ammunition for the troops stationed there.