Acting US defence secretary Patrick Shanahan said the US was still studying the Indian test, with researchers tracking about 270 different objects in the debris field from Wednesday's impact.
"My message would be: We all live in space, let's not make it a mess". "Space should be a place where we can conduct business, space should be a place where people have freedom to operate". "India registered its name as a space power".
"You can not make (space) unstable".
"Our scientists shot down a live satellite 300 kilometres away in space, in low-Earth orbit", he said in a television broadcast.
Shortly after PM Modi's televised address announcing the success of "Mission Shakti", India's Ministry of External Affairs released a detailed note informing the World that India's actions were only to augment its deterrence capabilities and did not intend to trigger an arms race in space.
Following the successful test, DRDO Chairman G Satheesh Reddy, who oversaw the top-secret operation, said that the government accorded clearance to the project around two years ago with an aim to deter threats to the country's space assets.
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"The NSA (Ajit Doval) whom we report to on strategic matters gave the direction to go ahead with the test and he had the concurrence from the Prime Minister".
Lieutenant General David Thompson, vice commander of U.S. Air Force Space Command, added the International Space Station was not at risk at this point.
Modi said the new capability is "not against anyone", and that India's policy remains against the use of weapons in space.
The announcement of the anti-satellite test comes a month after spiraling tensions with archrival Pakistan had raised fears of another conflict between the two countries.
The US carried out its first ASAT test in 1959.
The following year, the USA used a ship-launched SM-3 missile to destroy a defunct spy satellite in Operation Burnt Frost.