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B. Upender weeps by the coffin of his son Colonel B. Santosh Babu in Suryapet, India, Thursday, June 18, 2020. Babu was among the twenty Indian troops who were killed in the clash Monday night that was the deadliest conflict between the sides in 45 years.

Mahesh Kumar A/The Associated Press

In the days leading up to the most violent border clash between India and China in decades, China brought in pieces of machinery, cut a trail into a Himalayan mountainside and may have even dammed a river, satellite pictures suggest.

The images, shot on Tuesday, a day after soldiers engaged in hand-to-hand combat in the freezing Galwan Valley, show an increase in activity from a week earlier.

India said 20 soldiers were killed in a premeditated attack by Chinese troops on Monday night at a time when top commanders had agreed to defuse tensions on the Line of Actual Control (LAC), or the disputed and poorly defined border between the nuclear-armed neighbours.

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China rejected the allegations and blamed front-line Indian soldiers for provoking the conflict, which took place at an altitude of 4,300 metres in the western Himalayas.

The 4,056-kilometre border between India and China runs through glaciers, snow deserts and rivers in the west to thickly forested mountains in the east.

The Galwan Valley is an arid, inhospitable area, where some soldiers are deployed on steep ridges. It is considered important because it leads to the Aksai Chin, a disputed plateau claimed by India but controlled by China.

The satellite pictures, taken by Earth-imaging company Planet Labs and obtained by Reuters, show signs of altering the landscape of the valley through widening tracks, moving soil and making river crossings, one expert said.

The images shows machinery along the bald mountains and in the Galwan River.

“It looks like China is constructing roads in the valley and possibly damming the river,” Jeffrey Lewis, director of the East Asia Nonproliferation Program at California’s Middlebury Institute of International Studies. “There are a ton of vehicles on both sides [of the LAC] – although there appear to be vastly more on the Chinese side. I count 30-40 Indian vehicles and well over 100 vehicles on the Chinese side.”

Chinese Foreign Ministry spokesman Zhao Lijian said he was unaware of the specifics on the ground but reiterated that the Indian army had crossed into Chinese territory in several places in recent days and that it should withdraw.

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The clash was the most serious since 1967. Since early May, soldiers have faced off on the border where India says Chinese troops had intruded and set up temporary structures. The confrontation turned into a deadly brawl on Monday.

The fighting was triggered by a spat over two Chinese tents and observation towers that India said had been built on its side of the LAC, Indian government sources in New Delhi and on the Indian side of the border in the Ladakh region said.

China had sought to erect a “structure” in the Galwan Valley on India’s side of the LAC even after military officials had reached an agreement on June 6 to de-escalate, Indian Foreign Minister Subrahmanyam Jaishankar told China’s senior diplomat, Wang Yi, in a phone call on Wednesday, the Indian Foreign Ministry said. It was not immediately clear to what structure he was referring.

The problem arose when an Indian patrol visited the area near a ridge to verify a Chinese assertion that its troops had moved back from the LAC, the two government sources aware of the military situation said.

The Chinese troops had thinned out and left behind the two tents and small observation posts. The Indian party demolished the towers and burnt the tents, the sources said.

The satellite images show possible debris from the observation posts on Tuesday morning on a ridge on India’s side of the LAC. There was no such structure in the image taken a week earlier.

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A large group of Chinese soldiers arrived and confronted the Indian troops, led by Colonel Santosh Babu. They were lightly armed in line with the rules of engagement at the LAC, one of the sources said.

India and China have not exchanged gunfire at the border since 1967, despite occasional flare-ups. Soldiers are under instructions to keep their rifles slung at their backs.

It was not clear what happened next, but the two sides soon clashed, with the Chinese using iron rods and batons with spikes, one of the sources said.

Colonel Babu was one of the 20 victims, they said. More Indian troops were rushed in and the confrontation turned into an hours-long fight eventually involving up to 900 soldiers, the source said. Still no shots were fired on either side.

Chinese Foreign Ministry spokesman Mr. Zhao rejected the Indian version of the events. “The rights and wrongs of this incident are very clear. The responsibility does not lie with China.”

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