A press conference by María Corina Machado - the Nobel Peace Prize laureate, who is currently in-hiding - was cancelled on Tuesday, with the Nobel Institute saying they are "in the dark" about her whereabouts.
Machado is Venezuela's opposition leader and has been in hiding since the country's disputed 2024 election, which she and her supporters say was stolen.
She was awarded the Nobel Peace Prize for efforts to bring democracy to Venezuela, and was expected to formally collect it in a ceremony on Wednesday.
Although Machado regularly gives social media video updates, usually against a neutral white wall, her current whereabouts are unknown.
The Nobel Institute said in a statement: "María Corina Machado has herself stated in interviews how challenging the journey to Oslo, Norway will be. We therefore cannot at this point provide any further information about when and how she will arrive for the Nobel peace prize ceremony."
