clipped from: news.bbc.co.uk 
The crash of a B-52 aircraft, armed with nuclear warheads, in north-west Greenland back in 1968 has left a lasting legacy, according to those involved in the clear-up and those who live in the region now.
There are claims of long-term damage to the environment and to the health of individuals, allegations disputed by the governments involved.
Following the fire aboard the aircraft, the high explosives surrounding the nuclear weapons exploded but without setting off the actual nuclear devices, which were not armed.
Three of the four bombs being carried by the plane smashed on to the ice and broke into tiny fragments.
Radioactive material was widely dispersed across the ice and was also thrust into the sky in a plume of smoke, declassified documents show.