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Two federal law enforcement officials told the Associated Press they believe funding for Shahzad's plans was channeled through an underground money network known as "hawala.''

However, the officials say the people suspected of providing Shahzad money in the United States, including three people detained in Massachusetts and Maine, did not know what the money would be used for.

The AP also reported that authorities in Pakistan took six men into custody in connection with the car bomb plot, including the co-owner of a catering company that has done events for the U.S. Embassy.

Like Shazhad, the detainees are all said to be members of Pakistan's urban elite, and several were educated in America.