Trafficking in people for prostitution and forced labour is one of the most prolific areas of international criminal activity and is of significant concern to the United States and the international community. The overwhelming majority of those trafficked are women and children. According to the most recent Department of State estimates, roughly 800,000 people are trafficked across borders each year. If trafficking within countries is included in the total world figures, official U.S. estimates are that some 2 to 4 million people are trafficked annually. However, there are even higher estimates, ranging from 4 to 27 million for total numbers of forced or bonded labourers. As many as 17,500 people are believed to be trafficked to the United States each year. Human trafficking is now a leading source of profits for organised crime syndicates, together with drugs and weapons, generating billions of dollars. Trafficking in persons affects virtually every country in the world.