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their Indian rivals.

“Despite the grave provocation, (our) own troops exercised great restraint and behaved in a mature and responsible manner,” the Indian army said in a statement.

It is first confirmed shooting across the contested frontier for decades, where skittish border forces by convention do not use guns to avoid escalations of violence in remote terrain.

The relationship between the neighbours has plunged following a June clash in the contested region in which 20 Indian troops were killed.

A spokesperson for the Chinese People’s Liberation Army (PLA) gave no specifics on the apparent retaliation and gave no report of casualties, calling on India to probe the incident.

Tens of thousands of troops from both sides have been deployed to the disputed Himalayan border, which sits at an altitude of more than 4,000 metres (13,500 feet).

The countries fought a brief border war in 1962, but officially no shots have been fired in the area since 1975 when four Indian troops were killed in an ambush.

Because the frontier has never been properly demarcated and the high-altitude terrain is often disorientating, the practice for decades was for neither side to use weapons.

Detailed protocols set out procedures for peaceful disengagement if patrols strayed into areas that the other side believed were their territory.

But a serious clash in the Ladakh region on June 15 -- fought with fists and mediaeval-style weapons such as clubs studded with nails -- left 20 Indian troops dead.

China has also acknowledged suffering casualties but haven’t revealed any figures.

Since then, reinforcements have ranged on either side of the border.

India’s military has also reportedly changed its rules of engagement, allowing troops to carry guns.

Defence ministers from both countries met in Moscow last week but statements released later suggest reconciliation remains distant.

Earlier this week an Indian minister said Delhi had alerted China to allegations five men had been abducted by the People’s Liberation Army close to the disputed border.