Focus on ISIS after deadly London terror attack

ABC News' Martha Raddatz reports on the new strategies undertaken by ISIS as U.K. authorities say the deadly attacks in London seem to be linked to Islamic terrorism.
1:23 | 03/23/17

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Transcript for Focus on ISIS after deadly London terror attack
Robin. Alec, thank you. We'll bring in Martha Raddatz who we know that authorities are saying that attacks seems to be linked to islamic terrorism. You're saying ISIS is maybe getting squeezed and getting desperate. Reporter: They are. If you're looking at what is happening on the battlefields it looks bad for ISIS and have lost more than 60% of the terrain they once controlled in Iraq. 30% in Syria and they've lost tens of thousands of their fighters in the targeted strikes. But it really does seem that the greater the success that the U.S. And its allies are having on the battlefield the more desperate ISIS becomes. You've heard those ISIS leaders say to followers if they can't carry out attacks with explosives or firearms they should use knives or cars or whatever they can. Are they still largely recruiting online and if so, how is the administration responding. Reporter: Secretary of state Rex tillerson said this week the goal is to stop ISIS from getting its message out. But that is a very tough goal. Although they've made progress but if you just look at the numbers in Britain alone, they have some 850 people who have traveled to Syria and Iraq to support ISIS and about half of those have now returned to Britain and as we have seen far too many time, robin, it only takes one to reek horrible destruction. You're right, Martha. Thank you, Michael. Security here at home is stepping up in response to the

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