Leaders of the Arab world are lining up to co-operate with the United States in a global alliance against terrorism.
Saudi Arabia, Egypt, Jordan and others have all pledged their full assistance.
As reports emerge that Arab nationals are among the suspects, their
governments have been quick to distance themselves from them.
However, there are likely to be limits to the extent of Arab co-operation.
The first reaction of many in the Arab world to news of Tuesday's attacks was one of denial.
Surely, they said, no Arab or Muslim would ever commit a crime so heinous?
Denial
Editorials in the Egyptian press tried to convince their readers that it must have been the work of American fanatics.
One paper even speculated that only Mossad, the Israeli intelligence service could have had the organisation to do it.
But, as reports build up that investigators are focusing their attention on suspects from the Middle East, most Arabs and their governments are quickly lining up behind America.
The initial suspects are thought to have come from Saudi Arabia, Egypt and the United Arab Emirates. All three of these governments have unequivocally pledged to give Washington whatever help it needs in fighting terrorism.
The same goes for Jordan, Morocco and all the Gulf Arab states.
Even the Palestinian leader, Yasser Arafat, acutely aware of his own vulnerable position, has suggested forming an Arab coalition against terrorism.
It is as if nobody, except perhaps, Iraq's Saddam Hussein, wants to be left off the bandwagon.
Difference
But there is a difference between offering to fight terror and signing up to a western led military strike that targets Muslims.
Where will the Arabs stand, for example, if the blame rests with Iraq?
No-one here in the Arab world will feel comfortable with yet another blanket bombing of Iraq, a fellow Arab nation.
Doubtless, these various scenarios are already being played out in Washington and elsewhere, but it is clear that beyond tracking down the terrorists themselves, enlisting Arab help will have its limitations.