The fight in the Galwan Valley left at least 20 Indian soldiers dead and raised tensions between the two powers.

China did not acknowledge any casualties among its forces. Both sides accused the other of an incursion.

The border between the two nations in the region is poorly demarcated and can shift with topographical changes.

The image that emerged on Thursday showed crude weapons that appeared to be made from iron rods studded with nails. It was passed to the BBC by a senior Indian military official on the India-China border, who said the weapons had been used by the Chinese.
Defence analyst Ajai Shukla, who first tweeted the image, described the use of such weapons as "barbarism". The absence of firearms in the clash dates back to a 1996 agreement between the two sides that guns and explosives be prohibited along the disputed stretch of the border, to deter escalation.

The image was widely shared on Twitter in India, prompting outrage from many social media users. Neither Chinese or Indian officials commented on it.

Media reports said troops clashed on ridges at a height of nearly 4,267m (14,000 ft) along a steep terrain, with some soldiers falling into the fast-flowing Galwan river in sub-zero temperatures.

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