Polish prosecutors on Monday denied a report that police had arrested an online retailer who allegedly sold chemicals to the main suspect in the bomb and gun attacks in Norway that claimed 93 lives , reported dpa .
Anders Behring Breivik, 32, the alleged perpetrator of Friday's bombing in Oslo's government district and shooting at a youth camp on nearby Utoya island, said in a manifesto written before the attacks that he had obtained chemicals from a Polish retailer.
Radio station RMF FM had reported that a retailer based in Wroclaw in southern Poland had been arrested on Sunday on suspicion that he had assisted the perpetrator by providing agricultural chemicals that could be used to make a bomb.
Poland 's Internal Security Agency said there a "Polish witness" was cooperating in the investigation, but denied that anyone had been arrested. Prosecutors in Wroclaw also denied that anyone had been arrested or charged in connection with the attacks.
Polish authorities said an investigation based on a tip-off from Norwegian police had been conducted on Sunday, but declined to give details.
Norwegian police were leading the proceedings into the matter, Mariusz Sokolowski of the National Police told RMF FM. He added that Polish authorities did not want to release information that would "harm" the Norwegian investigation.
The suspect in the Oslo attacks, Norwegian Anders Breivik, had made "marginal purchases" in Poland, and bought raw materials for a bomb from many countries, mainly from Norway, according to Poland's Internal Security Agency.
The chemicals that had been purchased were legal, according to deputy head of the agency, Pawel Bialek.
Bialek said the suspect had "given a logical reason for the purchase" - that he would use the substances for farming. The retailer had no reason to be suspicious, officials said.