India says three of its soldiers have been killed in border clashes with the Chinese military in the western Himalayas.
The Indian army said senior military officials from both sides were meeting to calm the situation in Galwan Valley.
There were casualties on “both sides” during clashes on Monday night, India claims.
Chinese Foreign Ministry spokesman Zhao Lijian claims Indian troops crossed the border line twice on Monday, “provoking and attacking Chinese personnel, resulting in serious physical confrontation between border forces on the two sides”.
Earlier, he said he was not aware of any incident on the border with India after the Indian army said one of its officers and two soldiers were killed in a “violent face-off” there.
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The two sides have been locked in a standoff in the western Himalayas for weeks, though there had been no casualties on either side.
There were four stand-off points along India’s eastern and mountainous Ladakh region.
Violent clashes erupted near Patrolling Point 14 along a section of the unmarked border after India’s army said both sides had started disengaging from Galwan Valley.
In a statement, India’s army said: “During the de-escalation process underway in the Galwan Valley, a violent face-off took place yesterday night with casualties on both sides.
“The loss of lives on the Indian side includes an officer and two soldiers.
“Senior military officials of the two sides are currently meeting at the venue to defuse the situation.”
Zhao told reporters in Beijing: “China demands the Indian side restrict frontline soldiers and avoid unilateral moves that will complicate the border situation.”
The Asian giants have rival claims to vast swathes of territory along their 3,500 km (2,173 mile) Himalayan border, but the disputes have remained largely peaceful since a border war in 1962.
On Tuesday, Zhao said Beijing hopes for peace and stability on the Korean Peninsula after the North blew up its de-facto embassy amid escalating tensions with the South.