Venezuelan opposition leader Mara Corina Machado, who has been in hiding for months, has told the BBC that she knows "exactly the risks" she's taking by travelling to Norway to collect her Nobel Peace Prize. Machado appeared in Oslo in the middle of the night, waving from the balcony of a hotel. It was the first time she has been seen in public since January. The 58-year-old made the covert journey despite a travel ban and a threat from the Venezuelan government that she would be labelled as a fugitive.