NEW DELHI: India on Monday banned 59 Chinese mobile apps, including the wildly popular TikTok and WeChat, over national security and privacy concerns just weeks after a deadly Himalayan border clash between the nuclear-armed neighbours.

Relations between the world's two most populous nations have been strained following the deaths of 20 Indian troops in hand-to-hand fighting with their Chinese counterparts on the western end of the high-altitude, contested border in mid-June.

The apps "are engaged in activities... prejudicial to sovereignty and integrity of India, defence of India, security of state and public order," the ministry of information technology said in a statement.

"The government of India has decided to disallow the usage of certain apps... This decision is a targeted move to ensure safety and sovereignty of Indian cyberspace."

The statement said the move was taken after several complaints were received by the ministry alleging theft of users' data and violations of user privacy.

It was unclear when the ban would come into force.

The Indian soldiers were killed in a brawl along the disputed border in northern Ladakh region on June 15 in the deadliest faceoff for almost half a century between the two countries.