At least four people have died and several others are missing after an avalanche hit the northern Indian state of Uttarakhand, authorities have said.A rescue operation has been under way after the avalanche swept away road construction workers

Rescue crews are battling heavy snowfall and poor visibility in the search for survivors after an avalanche near India's border with Tibet. Dozens of construction workers were initially buried under the snow.

Officials in India say more than 40 construction workers are missing after an avalanche hit their camp in Uttarakhand state.