Two Pablo Picasso paintings worth millions of dollars were reported stolen from a Swiss exhibition of works by the Spanish painter, police said Thursday. The paintings were stolen Wednesday evening after closing time at the Seedamm-Kulturzentrum in the small town of Pfaeffikon, near Zurich. Police have yet to catch the culprits, they said in a statement. It was unclear how the burglars entered the culture center, but they set off a security alarm when leaving the building. Police said they are investigating whether the burglars locked themselves in the building before it closed. The two oil paintings, "Tete de cheval" ("Head of horse") of 1962 and Verre et pichet ("Glass and pitcher") of 1944, were on loan from the Sprengel Museum in Hannover, Germany, police said. The German museum has promised an award for those assisting in the arrest of the burglars and recovery of the paintings. The Sprengel declined to say how much the award was worth.