American investigators have discovered that several companies based in the US were used to transfer funds to some of the suspected assassins of Mahmoud al-Mabhouh, the Wall Street Journal reported on Saturday.The companies used include Internet-based businesses that match and process payments between employers and freelance job-seekers. Financial transfers were made through these businesses to prepaid, MasterCard cash-card accounts held by the alleged Dubai assassins.Two of the companies mentioned by investigators, Elance Inc. and Rent a Coder (now named vWorker.com), are well-known among freelance computer-programmers.Neither of the two companies was aware that it had been mentioned in a probe by investigators following the trail of money from the Mabhouh hit.