Most of the cases involving heroin abuse in Kenya have been reported in Mombasa. Seizure data indicate that the smuggling of heroin to and through the United Republic of Tanzania has also increased. Of all the substances seized by Tanzanian authorities, cannabis, khat (Catha edulis) and heroin (in that order) accounted for the highest amounts seized. The seized heroin originated in Afghanistan, India, Iran (Islamic Republic of) and Pakistan and had been destined for China, Japan, South Africa, Turkey and the United States, as well as countries in Europe.