A pencil drawing by Spanish artist Pablo Picasso valued at some $250,000 was stolen in Austria from the private collection of a Russian diplomat, Spanish news agency EFE said quoting the police.
"Corrida" was stolen on Tuesday along with other art pieces and luxury items from the Russian diplomat's house outside Vienna.
The drawing, which dates to 1920, is signed and shows a bull charging a horse in the sand of a bullring.
The thieves also took a small book signed by Picasso and valued at about $1,750, as well as another minor work by the artist called "Lisistrata".
Police said the robbery was probably the work of professionals who knew exactly what they were after.
The Russian diplomat's house did not have any type of security system, and the director of the police robbery squad in Lower Austria, Josef Grasel, told ORF radio that there was only "a dog who was happy whenever anyone showed up".