Norwegian police have arrested and charged a man over the theft of Edvard Munch's masterpieces The Scream and the Madonna.
Experts say it may be difficult to sell the stolen painting
Police say they are optimistic they will now recover the works.
The two paintings, jointly worth about $19m (£10.4m), were stolen in August in broad daylight at the Munch Museum in the Norwegian capital, Oslo.
The two paintings have not been recovered and are believed to be too well-known to be resold.
"The police are optimistic that the investigation will produce results and that the pictures will be brought back to the Munch Museum," Oslo police said in a statement.
The man arrested is said to be in his 30s. He will be questioned and jailed over the weekend, Reuters news agency reports.