In return, the sender offers a commission, usually in the range of several million dollars. The scammers then request that money be sent to pay for some of the costs associated with the transfer. Once money is sent to the scammers, they will either disappear immediately or try to get more money with claims of continued problems with the transfer.
In such matters the victims normally allege that they have received emails from unknown sources wherein they have been informed that:
The victims are trapped in a phased manner and are generally made to deposit a huge amount of money either as money transfer fee, payment of taxes or transportation cost.
The victims apparently receive a spam email and respond to the same and ends up paying money to some unknown persons for a nonexistent purpose.
Such crimes are generally carried out from foreign locations. Money is either deposited in offshore accounts or in some courier account in India.