Experts say it may be difficult to sell the stolen painting
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Police have questioned a man in Norway over the theft in August of Edvard Munch's famous painting The Scream.
Police said the man was interviewed as a suspect - their first since the robbery by masked gunmen in Oslo.
The robbers threatened the Munch Museum staff before taking the masterpiece and another painting, the Madonna, jointly worth about $19m (£10.4m).
The man was released without charge on Thursday, but is still considered a suspect, police said.
The lawyer for the 37-year-old man, who has not been named, said his client had an alibi for the day of the robbery.
He said the man was questioned over his alleged link to a black Audi car used as a getaway vehicle in the daylight heist.
The two paintings have not been recovered and are believed to be too well-known to be resold.
Security at the museum was criticised after the robbery, and the building could be shut for a period as it introduces drastic security measures.