London Incidents: Powerful Message

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The latest incidents in London's mass transit system represent a new tactic in terrorists' tool kits, and may be a means for the terrorists to announce they won't be stopped, according to one terrorism expert.

"This would be the first time we've seen follow-up attacks following any major attack, anyplace in the world," Neil Livingstone told The Early Show co-anchor Hannah Storm. "There were no follow-up attacks after 9-11. There were no follow-up attacks after the Madrid attacks.

"And this would show a much greater level of sophistication, that they've been able to take advantage of the terror and panic they caused 10 days ago by now revisiting that. Even though there are no reports of casualties at this time, London is on edge, and they have terrified the city and brought it to a standstill once again."

Livingstone says the possible implications of the new incidents don't bode well: "This sends a very powerful message, and what they're saying is, 'No matter how great your network of informants and cameras and so on, you still can't stop us. You can arrest us. We can have people that are killed in these attacks, but we have other people that are willing to carry out further attacks. And so we're going to be there, and we're going to be there for a long time.' "

He added, "We know that these people are probably out there, still, and they may be able to carry out further attacks."