He said if terrorists succeed in making us change what we do, then they have succeeded in fact.

The terrorists succeeded in wiping an American landmark off the map; building nothing in its place will simply affirm their crime.

A failure to share intelligence allowed the 9/11 terrorists to succeed despite advance hints of their presence and intentions.

"There is no way these terrorists can succeed here," Colonel Belov said.

They also said that rules on when they might use deadly force were ambiguous and could allow terrorists to succeed.

Had the terrorists succeeded in bringing the roof of the station down, the casualties could have surpassed those of 9/11.

However the terrorists succeed in the third attack where they blew a dam and flooded the city of Kiev.

"These terrorists succeeded because of secrecy, and we don't have the best of relations with the Taliban," he said.

The fact is that, twist it how you will, the terrorists obviously succeeded in influencing the sovereign decision of the Spanish electorate.

"We said, in some very small way, if we had blinked on this, then the terrorists would have succeeded."