The landslide occurred when a small hillock near the Old Inspection Bungalow caved in and buried several houses in Bhalukpong town, West Kameng district superintendent of police (SP) A Koan said.
While five bodies were retrieved from the debris, five others were still missing as rescue operation had to be suspended due to darkness and would resume tomorrow morning.
The SP, who is camping at Bhalukpong to supervise rescue operations, said torrential rains in the past couple of days have triggered flood-like situation in the town bordering Assam.
The bodies extricated from the debris were identified as Leel Bahadur Chetry (57), Dilip Gwala (15), H Barman (54), Durga Barman (45) and Rina Barman (24).
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An NDRF team from Doimukh, near here, comprising two senior officers and 30 personnel left for Bhalukpong in the evening in five vehicles equipped with life-saving equipment including Medical First Responder and Collapsed Structure Search and Rescue.
According to an official report, the torrential rain that triggered landslides on a road near Tippi has caused substantial damage to school buildings, circuit house and storehouses of PHE, PWD, WRD and RWD departments besides flooding the local police station.
While mourning the deaths, Rajkhowa announced an ex-gratia relief of Rs one lakh each for the next of kin of the victims from his relief fund.
He cautioned the people and advised them to remain alert and take necessary precautions as the state is experiencing torrential rainfall, a Raj Bhawan release said.
Chief Minister Kalikho Pul also expressed grief over the loss of lives.
Pul, who is monitoring the situation from New Delhi, has directed the West Kameng district administration to mobilise all heads of departments, officials and staff, including the Army, ITBP and local police for search and rescue operation.
Pul also directed the authorities to dispatch teams from Itanagar to the site with ambulances, paramedics and nurses and also asked them to set up medical camp at the site.