Silkyara and Dandalgaon on the Brahmakhal-Yamunotri national highway in Uttarkashi district collapsed in the early hours of Sunday, trapping around 40 workers inside, police said. They said the incident occurred around 4 am when a 150-metre-long portion of the four-and-a-half-kilometer-long tunnel collapsed.
As soon as information about the incident was received, Uttarkashi Superintendent of Police Arpan Yaduvanshi immediately reached the spot and launched a relief and rescue operation, police added.
National Disaster Response Force, State Disaster Response Force, fire brigade and employees of the National Highways and Infrastructure Development Corporation Limited (NHIDCL), the organisation that is constructing the tunnel, are at the spot as well, they said.