Paintings by Cezanne, Degas, Van Gogh and Monet worth $160m are stolen from a Zurich museum by three masked and armed gang.The armed gang threatened a security guard before seizing the four paintings. The art theft is one of the biggest in the world in the last 20 years.The four paintings are Poppies near Vetheuil, by Claude Monet (1879), Count Lepic and his Daughters, by Edgar Degas (1871), Chestnut in Bloom, by Vincent Van Gogh (1890) and Boy in a Red Jacket, by Paul Cezanne (1888).