Relief and rescue operations are in full swing in quake-hit Sikkim, West Bengal and Bihar. Government started air dropping of food to earthquake-affected people in Sikkim. Union Home Secretary R K Singh told reporters in New Delhi that two medical teams with doctors and paramedics have reached worst affected Mangan and Sangthan with the help of helicopters. He said, nine helicopters were engaged in carrying out rescue and relief operations– mostly in worst-hit North district. Detailing on the restoration work being undertaken by various agencies, the Home Secretary said that road to Gangtok has been opened to traffic besides power has been restored in the city. Quoting defence sources AIR correspondent reports, over 5,000 troops, six transport aircraft and a total of 15 helicopters have been deployed by the armed forces in the quake hit Sikkim to carry out relief operations. Defence spokesperson Colonel A.S.Chauhan said in New Delhi ,that the road connecting Gangtok with North Sikkim has been cut off at several places. Three battalions of army and one battalion of ITBP with over 4,500 men are present in that area. He said, connectivity has been maintained through helicopters and work is on to restore the road, which is crucial for reaching the area bordering China. Meanwhile, two Mi-17 helicopter of IAF carried relief material and National Disaster Relief Force (NDRF) personnel to Lachen and Mangan in North Sikkim Area. One Mi-17 Chopper with Medical Team and relief equipment has got airborne for Gangtok. Border Roads Organisation has been able to reopen the Himalayan state's life line-the National Highway 31-A.