GENEVA (The Associated Press)—A Joseph Beuys painting and a collection of African art worth around 2.4 million Swiss francs ($1.9 million) were stolen from a house near Geneva, police said June 20.

The thieves broke into the house and carried away the art on April 12, said Patrick Pulh of the police for the canton of Geneva.

They stole 140 objects from the private collection, including masks and statues from West Africa, he said.

No arrests have been made, Pulh said.

The artworks, which came from countries like Mali, Cameroon, Ghana and Ivory Coast, included several tall masques, including a wooden mask with a crest measuring 6.2 feet, according to the insurance company that registered the collection.

"Some of the objects have a value of over 100,000 francs, but most of them are worth around 10,000 francs," said Barbara Koenig, spokeswoman for Allianz insurance.

The haul also includes an untitled 1977 painting made of natural rubber by German avant-garde artist Beuys. The painting has an estimated value of 198,000 francs ($159,500), Koenig said.

Police said they assume that the thieves were art experts.