At least 40 construction workers were trapped on Sunday after the road tunnel they were building collapsed in northern India, with rescuers scrambling to reach them beneath piles of debris.
The collapse occurred early Sunday morning in the Himalayan state of Uttarakhand when a group of workers were moving out and replacement workers were going in.
"About 200 metres of the tunnel have collapsed," Durgesh Rathodi, a state disaster response official, told AFP from the site.
"About 40 to 41 workers are trapped inside. Oxygen is being supplied through the debris, but more rubble is coming down as rescuers try to remove the obstruction."
The 4.5-kilometre tunnel is being constructed between Silkyara and Dandalgaon to connect two of the holiest Hindu shrines of Uttarkashi and Yamnotri.
Photographs released by the government rescue teams showed huge piles of concrete blocking the wide tunnel, with twisted metal bars on its broken roof poking down in front of the rubble.
"Pray to god that those workers trapped inside the tunnel are brought out safely," Uttarakhand chief minister Pushkar Singh Dhami wrote on social media platform X.
A local police officer told the Press Trust of India news agency they were "very optimistic" the men would be rescued safely, but added it was "difficult to say how long it will take".
The tunnel is part of Prime Minister Narendra Modi's favourite Char Dham Road Project meant to improve connectivity for some of the most popular Hindu shrines in the country, as well as areas bordering China.