US and Russian communications satellites have collided in space in the first such reported accident. A satellite owned by the US company Iridium hit a defunct Russian satellite at high speed nearly 780km (485 miles) over Siberia on Tuesday, Nasa said.

The risk to the International Space Station and a shuttle launch planned for later this month is said to be low. The impact produced massive clouds of debris, and the magnitude of the crash is not expected to be clear for weeks.

Read it at BBC News