Polish investigators detained 19 people and searched some 100 locales in connection with June\'s bombing and shooting massacre in Norway that killed 77 people, dpa quoted prosecutors as saying Wednesday. Police found that a Polish online retailer had sold chemicals to Anders Behring Breivik, 32, the alleged perpetrator of the attacks in Oslo and shootings at a youth camp. Officials said they were investigating whether any other people had bought from the retailer large quantities of chemical substances that could be used to make explosives. An Oslo court ruled in September that Breivik, who has admitted to the twin attacks, was to remain in custody until mid-November.Norwegian police have said that Breivik has admitted to detonating a car bomb that killed eight people in central Oslo and a subsequent shooting that claimed 69 lives at a youth camp organized by the Labour Party.