Paintings worth about $91 million were stolen from a Zurich museum in an armed robbery in the second dramatic art theft in the area within days, police said on Monday, according to Reuters. Oil paintings by Cezanne, Degas, van Gogh and Monet were among those stolen in broad daylight on Sunday from the private Buehrle Collection in Zurich, Switzerland's largest city and the country's financial capital, police said in a statement. The high profile heist follows the theft of two Picasso paintings -- Tete de Cheval, from 1962, and Verre et Pichet, from 1944 -- from a nearby cultural centre last week. Police told Reuters that they had no concrete leads on the Picasso theft and that the investigation was ongoing. Police said it was unclear how many people were involved in the robbery. Police, who plan a news conference at 1230 GMT, also declined to say whether they thought the two thefts were connected. The Sunday theft occurred near the impressionist collection amassed by the late Swiss industrialist Emil Buehrle -- one of the most controversial business figures of his time for selling anti-aircraft canon to Nazi Germany during World War Two.