In August 2001 Boris Gryzlov claimed that up to 100 industrial enterprises in Saint Petersburg, including the Petersburg Fuel Company, a leading gasoline retailing operator in the city, as well as the four main sea ports of Northwestern Russia, Saint Petersburg, Kaliningrad, Arkhangelsk and Murmansk, were controlled by the Tambov Gang. In May 2002 he sent a commission to St. Petersburg to investigate corruption allegations in the city's gasoline market. The investigation was initiated after the Faeton Gasoline Company, the second leading fuel retailing company in the city, had complained to both Gryzlov and the Prosecutor General's Office in April that the Saint Petersburg City Administration had given preferential treatment to the Petersburg Fuel Company.