A total of 17 people were trapped in the mine, the Chongqing municipal government said on its social media account. One person was taken to a hospital, and the others showed no signs of life, the post said.
The blast took place around 5 am when a joint team of the CRPF's special jungle warfare unit, CoBRA, and the state police was carrying out an operation in the forests of Kuchai area in the district, officials said.
The Sri Lankan government has beefed up the security in the country post the deadly bombings that claimed more than 250 lives. A nation-wide emergency including night time curfew is in place at present which may also affect travel within Sri Lanka.