Rescue workers in Germany are attempting to free a mountaineer who got trapped in a 1,000m-deep cave after getting injured a rockfall, police said.
The 52-year-old reportedly suffered head and body injuries while exploring the cave, one of the biggest in Europe, near Berchtesgaden in south-east Germany.
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The world's first ever 'hole in the wall' was installed in Enfield, north London, on June 27 1967.
America says it has "identified preparations" for an attack similar to that which killed at least 86, including 30 children, in April.