German Nazi-era art hoarder Cornelius Gurlitt, who died on Tuesday, has made the Bern Art Museum in Switzerland his "sole heir".

The reclusive son of Adolf Hitler's art dealer is estimated to have amassed a collection worth up to a billion euros.

The museum said the news struck "like a bolt from the blue", given that it had had no relationship with Mr Gurlitt.

The collection was the subject of a long legal dispute over works that may have been taken illegally by the Nazis.