China has told India to withdraw troops from the Nathu La pass in the Himalayas.
In a dispute which has raised tensions between the countries, China has accused India of incursion into its territory between Sikkim and Tibet.
India has similarly recently accused Chinese troops of incursion on its side of the border.
The Nathu La pass is used by Indians on pilgrimages to Hindu and Buddhist sites in Tibet.
Though tensions flare from time to time the last notable clashes in the region between China and India took place in 1967.
Reuters has cited Chinese officials as warning the development could "threaten peace".
There have been recent condemnations from China as India opened its longest bridge, which connects to the disputed state of Arunachal Pradesh. China claims the area as its own and refers to it as “southern Tibet”.