March 6 (Reuters) - The United States on Friday filed two civil forfeiture complaints for more than $15.3 million used to allegedly fund an illicit Iranian oil distribution network, the Justice Department said in a statement.The complaints by the Justice Department allege that the funds were being used by Mohammad Hossein Shamkhani to "operate multiple distribution companies" engaged in selling and shipping Iranian oil and other commodities in violation of U.S. sanctions.