The US has successfully hit a disabled spy satellite with a missile fired by a warship.

Contact with USA 193, believed to be a radar imaging reconnaissance satellite, was lost shortly after its launch in December 2006.

The US Department of Defence (DoD) opted to shoot down the satellite before it re-entered the earth’s atmosphere due to a large quantity of hydrazine fuel on board.

The fuel, believed to be frozen, would survive the heat of re-entry and could leak toxic gas over a wide area, harming or killing people if inhaled, the DoD says.

The satellite was hit by a SM-3 missile fired from a warship near Hawaii, at a distance of 130 miles.

It is not yet known if the fuel tank was ruptured.

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Remains of the satellite are expected to begin to fall to earth immediately, with 25 percent expected to survive re-entry, US officials say.

The mission has been criticised by China and Russia, who say it is a cover for the testing of an anti-satellite weapon.

China carried out such a test last year, prompting fears of a space arms race.

Russia says spacecraft have crashed to earth in the past, many with toxic fuel on board, but had never merited such “extraordinary measures”.

By Elizabeth Clifford-Marsh