NEW DELHI: India's foreign ministry on Thursday said that China has deployed large numbers of troops and weapons along a mountainous border, in violation of bilateral agreements and leading to a clash this month in which 20 Indian soldiers were killed.

"At the heart of the matter is that since early May the Chinese side had been amassing a large contingent of troops and armaments along the LAC," ministry spokesman Anurag Srivastava said in a briefing in New Delhi, referring to the Line of Actual Control, the de facto border.

"This is not in accordance with the provisions of our various bilateral agreements," he said, including a 1993 treaty that dictates that both sides will maintain limited border deployments.