A large spy satellite is out of control and could crash to Earth in the next few weeks, a US government official has said.

The unnamed official warned that the satellite could land anywhere on the planet and may contain hazardous materials.

Speaking to Associated Press, the source said that US lawmakers and other nations were being kept abreast of the situation.

In response to the reports Gordon Johndroe, a spokesman for the National Security Council, said "Appropriate government agencies are monitoring the situation.

©Unknown
The satellite is the size of a small bus


"Numerous satellites over the years have come out of orbit and fallen harmlessly. We are looking at potential options to mitigate any possible damage this satellite may cause."

He refused to discuss specifics, such as whether the satellite might be destroyed with a missile. However, the director of the defense research group GlobalSecurity.org, John Pike, told AP that this was unlikely as such a move would create a rain of debris which could cause more widespread damage.

While the US government is yet to release any information about the spacecraft, Mr Pike said that it is most likely a photo-reconnaissance satellite, weighing as much as 20,000lb (9,000kg) and the size of a bus. It is believed to contain hydrazine, a common rocket fuel, which is hazardous to humans.

This is not the first time a large man-made satellite has de-powered and crashed uncontrollably in to the atmosphere. The largest was in 1979, when Skylab, a 78-ton abandoned space station, lost control and fell from orbit.

It fell apart on re-entry, with the debris crashing harmlessly into the Indian Ocean and across an uninhabited part of Western Australia.