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'Eso es totalmente erróneo. No voy a permitir que eso pase', dijo el presidente de Estados Unidos

Many believed to be women and children kidnapped from villages around syria. joining me from the pentagon cnn's barbara starr. what else do we know about these hostages? >> reporter: good evening, jake. the pentagon watching all of this very carefully because there have been air strikes they have conducted in the area. this is northeastern syria. these are syrian christians more than 260 now said to be held hostage by isis and that is double the estimate of just a few days ago as isis fighters have swept through this northeastern region across many villages, capturing women, children and the e...

Researchers suspect there could be dozens more. the leading theory is the phenomenon is tied to climate change. researchers say that's causing permafrost to thaw leaving methane gas trapped under ground which eventually explodes. russian scientists have called for an urgent investigation. they are worried the craters could jeopardize nearby gas fields while spewing highly flammable methane into the atmosphere. while the idea of climate change may be a source of controversy here in the u.s. even debate on some shows, in one part of the world they can't afford to debate whether or not climate ch...

Londoner. he graduated from university in 2009 with a degree in information technology. he used to live in this house on a quiet london street. he disappeared in 2012. his family says to syria. i want to get to cnn chief national security correspondent jim sciutto. what else are we learning this mohammad emwazi? >> in effect we learned the accent was real. he was indeed a british national, born in kuwait. in addition to that well off, relatively well educated and radicalized fairly quickly, it seems, after some bad encounters with the authorities. together his case and others we have seen rece...

And they'll even call your old provider. it's easy. even she could do it. whatever, janet. for all the confidence you need td ameritrade. you got this. welcome back to "the lead." i'm jake tapper. more on our top story in the national lead the threat of islamic terrorists here and abroad. today we are learning new details about two new yorkers accused of trying to join isis and wreak havoc and terror and a third man arrested for allegedly trying to help them. one allegedly threatened to kill president obama. they had trouble carrying out their plans partly at least because one of their mothe...