Landslides and inclement weather today hampered rescue operations in quake-hit Sikkim as the death toll in the 6.8 magnitude temblor mounted to 66, including 39 in the Himalayan State.

The earthquake, which struck last evening, left a trail of devastation damaging roads, buildings and other structures, uprooting mobile phone towers and snapping communication and power lines. Aftershocks made people panic in several areas forcing them to spend the night outdoors.

West and South districts in Sikkim remained inaccessible to the Army due to landslides and inclement weather and rescuers were facing an uphill task to reach these areas, Major General S.L. Narasimhan, GOC 17 Mountain Division, told reporters here.

Sikkim accounted for 39 deaths alone, with most casualties taking place in the North District and in towns and villages like Rangpo, Dikchu, Singtam and Chungthang located along the course of Teesta river, officials in the district control room said.

Eight persons travelling in a bus of Teesta Urja Limited in North District are presumed dead as their vehicle got stuck under debris caused by a landslide, Gen. Narasimhan said. This, however, has not been incorporated in the official figure of those killed.

The overnight toll climbed to 66 which included six deaths in West Bengal and seven each in Bihar, Nepal and Tibet, official reports said. Over a hundred people have been injured.

Gen. Narasimhan said army has launched ‘Operation Madad' in Gangtok and other areas by deploying over 2,500 troops. “We are also sending teams to Darjeeling and Kalimpong (in West Bengal),” he said.

A group of 14 tourists were rescued by the army from north Sikkim last night, Gen. Narasimhan said.

In Delhi, Prime Minister Manmohan Singh announced Rs 2lakh as ex-gratia to next of kin of those killed in the earthquake and Rs 1 lakh each for those seriously injured.

Six people have died in different areas of north Bengal, the Chief Minister, Ms Mamata Banerjee, who is on her way to Kurseong in Darjeeling district, said, adding that she would review the situation there with officials.

She said efforts were on to repair the damages to NH-31A and NH-55 caused by landslides on a war-footing. She also announced compensation of Rs 2 lakh each for the next of kin of those who died in the State.

In Bihar, seven people have died with several houses being damaged in four districts. While Darbhanga alone accounted for four deaths, one each was reported from Nawada, Nalanda and Bhagalpur districts, officials at the state headquarters said.

Chinese State-run news agency Xinhua reported that at least seven persons have been killed and 22 others injured in Tibet in the quake which has caused landslides and has disrupted traffic, power and water supplies as well as telecommunication in Yadong County, an area 40 km away from Sikkim.

Seismic observatory in Shillong said that an earthquake of 4.3 magnitude on the Richter scale shook parts of Meghalaya today.

In Gangtok, the Sikkim Chief Minister, Mr Pawan Chamling, announced an ex-gratia compensation of Rs 5 lakh for the kin of the deceased, Rs 50,000 for those grievously injured and Rs 25,000 for those with minor injuries.