Heavy rains lashed North Sikkim on Thursday night which resulted in the overflow of nearby rivers leading to the flash flood that engulfed the highway.
Areas such as Lachen and Lachung in North Sikkim have been cut off from the rest of the state due to flash flood, they said.
The flash flood has caused severe damage to infrastructure along the highway, making it unsafe for any kind of vehicular movement, officials said.
Local authorities are currently assessing the situation and Border Roads Organisation is working to clear the debris and restore normalcy.
However, it is expected to take some time before the highway can be reopened for traffic, they said.
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Home/India News/Heavy Rains Trigger Flash Flood In North Sikkim, Submerge NH 10 At Pegong