WASHINGTON, May 20 (Xinhuanet) -- U.S. Federal Bureau of
Investigation (FBI) Director Robert Mueller warned on Monday that
walk-in suicide bombers like those in Israel will inevitably hit
the United States.
   "I think we will see that in the future, I think it's
inevitable," Mueller said while responding to a question after a
speech in Alexandria, Virginia.
   "I wish I could be more optimistic," he added.
   Mueller admitted that it is difficult for law-enforcement
agencies to penetrate into the inner circle of a suicide bomber
terrorist group and get information to prevent such attacks.
   Mueller's warning came one day after U.S. Vice President Dick
Chenney said it is almost certain that al-Qaeda networks would
attack U.S. targets again although it is unclear when and where
the attacks might occur.
   "I think that the prospects of a future attack on the U.S. are
almost a certainty," Cheney told "Fox News Sunday." "It could
happen tomorrow, it could happen next week, it could happen next
year. And we have to be prepared," he said.
   Cheney also said on Sunday that he sees "a real possibility"
that walk-in suicide bombers may hit the United States, if those
who have attacked Israel succeed in changing the political
situation in the Middle East.
   The U.S. government has recently intercepted a series of vague
but menacing messages that appear to be communications among Al
Qaeda terrorists who could be planning a strike in the U.S.,
government officials said.   Enditem