According to MSNBC, a man named Niaz Khan was recruited to be a hijacker for Osama bin Ladin, was flown into the US, then changed his mind and went to the FBI.
Read about it here:
http://www.msnbc.msn.com/id/5131524/
The FBI held him for a few weeks then sent him to the British, who let him go after two hours of questioning.
Wonder how much play this will get? Wonder how much longer Mr. Khan will remain alive?