Apparently, a lone thief made off with five paintings from the Museum of Modern Art in Paris, including a Picasso and a Matisse.

http://news.bbc.co.uk/2/hi/europe/10130840.stm

Now here's something interesting. From the above link:
The paintings are estimated to be worth some 500m euros (£431m; $618m).
From a CNN link:
The artworks are worth a total of just less than 100 million euros ($123.7 million), said Christophe Girard, cultural attache to the Paris town hall, which runs the museum.
Bloomberg clarifies:
The paintings are together worth about 100 million euros ($123 million,) Christophe Girard, the Paris city official responsible for culture said as he visited the scene of the crime today. He dismissed earlier reports putting the value as high as 500 million euros.