Story highlights India has launched a massive aid mission to its earthquake-hit neighbor Nepal

Disaster relief troops and tons of food, water and medicine have been flown in

New Delhi, India (CNN) As the earth shook in Nepal, tremors were felt over the border in India as well.

It was a call to action: Within hours of the first 7.8 magnitude quake, India began planning a massive cross-border aid mission.

With each hour, the scale of the devastation in Nepal became clearer -- some 3,862 people are known to have died so far -- and plans in India, where 72 people were also killed, got bigger.

On Sunday alone, India delivered 187 tons of supplies, including 50 tons of water, 22 tons of food and 2 tons of medicine. And there will be more to come.

Hundreds of trained disaster relief troops landed in Kathmandu and quickly got to work.

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