Three Indian soldiers have been killed in a clash with Chinese forces in Ladakh in the disputed Kashmir region.
The deaths are the first in the disputed border area in at least 45 years, and follow rising military tensions between the nuclear powers.
The Indian army said senior military officials from both sides were "meeting to defuse the situation", adding that both sides suffered casualties.
An Indian army spokesman said the dead were one officer and two soldiers.
China did not confirm any casualties, but accused India of crossing the border in the Galwan Valley.
Chinese foreign ministry spokesman Zhao Lijian said India had crossed the border twice on Monday, "provoking and attacking Chinese personnel, resulting in serious physical confrontation between border forces on the two sides", AFP news agency reported.
Both sides insist no bullet has been fired in four decades, and the Indian army said on Tuesday that "no shots were fired" in this latest skirmish.
Local media outlets reported that the Indian soldiers were "beaten to death" but there was no confirmation from the military.
China's Global Times newspaper reported that "solemn representations" had been made with India over the incident.
The clash comes amid rising tensions between the two powers, which have brawled along the border in recent weeks but not exchanged any gunfire.
India has accused China of sending thousands of troops into Ladakh's Galwan valley and says China occupies 38,000sq km (about 14,700sq miles) of its territory. Several rounds of talks in the last three decades have failed to resolve the boundary disputes.