text: Norway Searches for Treasured Masterpieces OSLO, Norway - Police fielded a flood of tips but still had no motive Monday for the daring theft of "The Scream" and another Edvard Munch masterpiece by armed robbers who barged into a lightly guarded Oslo museum and ripped the paintings from the walls before the eyes of stunned visitors.    Police, who launched a nationwide hunt for the works, said there had been no word from the thieves, who were widely expected to demand a ransom...