Iran burnt at least 100 tons of illicit drugs on Wednesday in the capital in a ceremony attended by officials and foreign dignitaries. Officials said Tehran seized more than 500 tons of various narcotics in the last Iranian calendar year, which ended March 20. The ceremony came as the world marked the annual UN International Day Against Drug Abuse and Illicit Trafficking. Iran is located on a major drug route between Afghanistan and Europe, and large amounts of drugs flow through the country.