article_snippet: Authorities were not able to retrieve any bodies Tuesday, with the frozen ground complicating the effort.
article_snippet: As of Tuesday evening, there were few clues.
article_snippet: And We don't know the cause.
article_snippet: The sports hall of a local school has been freed up to take in bodies of the victims of the crash, said Sandrine Julien from the town hall of Seyne-les-Alpes village.