http://news.bbc.co.uk/2/hi/science/nature/7885051.stm
"US and Russian communications satellites have collided in space in what is thought to be the biggest incident of its kind to date.
The US commercial Iridium spacecraft hit a defunct Russian satellite at an altitude of about 800km (500 miles) over Siberia on Tuesday, Nasa said..."
also
http://news.bbc.co.uk/2/hi/science/nature/7885750.stm