Sikkim landslide helpline numbers have been issued by authorities after a major landslide near Theng Tunnel partially blocked the Teesta and Chyakoong rivers in Sikkim’s Mangan district. The incident occurred during the intervening night of September 5 and 6, prompting increased monitoring along the river belt and precautionary alerts for vulnerable downstream areas.
The landslide occurred above the Chyakoong River, opposite OC Bhir in the Naga Forest area near Theng Tunnel. A substantial section of hillside along the newly constructed Naga-Tosa Road collapsed close to the confluence of the Teesta and Chyakoong rivers. The debris partially obstructed the flow of both rivers and temporarily affected the Teesta.
Sikkim landslide helpline numbers released
The Sikkim State Disaster Management Authority (SSDMA) and State Emergency Operations Centre (SEOC) have released emergency contact numbers for residents who need assistance or want to report changes in river conditions.
The main SSDMA and SEOC numbers are 03592-201145, 03592-202461 and 03592-205256.
District-specific contacts include 03592-281007 for Mangan, 03592-204995 for Gangtok and 03595-263009 for Namchi. Residents can also contact 03595-250633 for Gyalshing, 03595-291660 for Soreng and 03592-200024 for Pakyong.
Residents facing an immediate emergency can also use India’s pan-India emergency response number, 112, which provides coordinated assistance from police, fire, health and other emergency services.
River flow remains normal for now
Despite the partial blockage, officials said the Teesta River was continuing to flow normally. Water has accumulated in sections of the Teesta and Chyakoong rivers, but both continue to maintain partial flow.
There have been no reports of deaths or injuries so far. Authorities are assessing whether the landslide has caused damage to property, while personnel on the ground continue to monitor the affected stretch.
Water levels at the Sankalang and Phidang observation posts were reported to be normal, although the river water had turned muddy. Officials have directed the observation posts to maintain continuous surveillance and immediately report any significant changes in water level or flow.
Authorities monitor vulnerable areas
The Mangan district administration, police personnel and local teams are closely monitoring the landslide site and the wider Teesta river belt. The Police Control Room has also been asked to alert vulnerable areas in the lower belt as a precautionary measure.
Authorities have advised residents to stay away from the Teesta and Chyakoong riverbanks along the affected stretch until further assessment is completed. Such precautions are particularly important because unstable slopes and changing water conditions can create additional risks after a landslide.
The Sikkim landslide helpline system is intended to help authorities receive timely reports from residents and coordinate emergency responses if conditions change.
Public urged to avoid unverified information
The administration has also urged people not to circulate unverified photographs, videos or claims about the incident on social media. Residents have been advised to rely on information issued by the SSDMA, district disaster management authorities, district administrations and Sikkim Police.
People living near the affected river belt have specifically been asked to report unusual changes in water flow, colour or levels through the nearest district disaster management authority or the official Sikkim landslide helpline.
The incident comes as Sikkim continues to remain vulnerable to landslides and other monsoon-related hazards because of its mountainous terrain. Continuous monitoring is therefore crucial, particularly around river valleys, road-cutting areas and unstable slopes.
For now, officials have said there is no immediate downstream threat, but monitoring remains active. Residents are being encouraged to remain alert, avoid risky riverbank areas and use official emergency contacts if they notice any sudden change. The administration is expected to issue further updates after a detailed assessment of the landslide site and surrounding river conditions.