The US terror attacks were financed with a $500,000 bankroll, a law enforcement source says.
The FBI source says the money is all linked in some way to the plot.
The Washington Postreports the FBI has documented large cash withdrawals and a long trail of hotels, rental cars and airplane trips.
Osama bin Laden - money trail said to lead to him
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The FBI is focusing on Osama bin Laden sympathisers in England, Germany and the United Arab Emirates, authorities say.
One official says more agents have been sent in recent days to Germany, where a cell of Osama bin Laden's al-Qaida network is said to be operating in Hamburg.
Timemagazine reports that Mohamed Atta, a leader of the hijackers, received wire transfers of cash on September 8th and 9th via a money service in Florida.
It says FBI records show the sender was Mustafah Ahmed, a suspected bin Laden financial operative in the Middle East.
The FBI, CIA and other US agencies have painstakingly recreated the travels of the 19 hijackers over years through Germany, Afghanistan, Spain and London.
AP