Satellite could plummet to Earth
A "large" US spy satellite has gone out of control and is expected to crash to Earth some time in late February or March
A spokesman said "numerous" satellites had come out of orbit and fallen back to Earth harmlessly over the years.
The satellite contains the rocket fuel hydrazine, a government official told AP on condition of anonymity.
A colourless liquid with an ammonia-like odour, the fuel is a toxic chemical and can cause harm to anyone who comes in contact with it.
John Pike, director of the defense research group GlobalSecurity.org, said an uncontrolled re-entry could risk exposure of US secrets.
Jeffrey Richelson of the National Security Archive, said the satellite is probably a photo reconnaissance satellite.
clipped from: news.bbc.co.uk