Authorities did not find any toxic substances on a Transaero plane being investigated in connection with the poisoning death of former Russian spy Alexander Litvinenko, a company official said Thursday. Irena Borodulina, a spokeswoman for the Russian airline, said authorities searched one of her company's planes - and that it had been cleared of radiation contamination. "Local security did not find on Transaero planes any toxic substance," she said. It was not immediately possible to confirm this with the Home Office. British airports operator BAA also said the Transaero flight had been cleared.