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Miller: Appears 'Like There Is No Other Terrorist Plot' In Dzhokhar Tsarnaev Probe

BOSTON (CBS) - Boston Marathon bombings suspect Dzhokhar Tsarnaev is communicating with investigators from his hospital bed and it appears, according to CBS News, that there is no second wave of plots or plotters out there.

Tsarnaev is under heavy guard in serious condition at Beth Israel Deaconess Medical Center with gunshot wounds to the throat and leg.  The throat wound has left him unable to speak, so he's responding to questions in writing.

"What they're focused on," CBS News senior correspondent John Miller said Monday morning, "is public safety exception stuff, which is - what could endanger the public? What could still be out there? And what they've been able to do is give him questions and he's answered in writing, but it's basically - where did you make the bombs? Are there any more explosives out there?  Are there any more cells? Are there any more people?"

"And while I'm told he's being cooperative, I'm also getting the sense… that he's not saying there is a whole second wave of plots or plotters here. Still there are places where they made the explosives and other things to find, it sounds like," Miller said.

"I'm suggesting it is appearing much more like there is no other terrorist plot out there. But this is a slow process in writing and you know they're going through that now, so information could develop or change."

Investigators are trying to figure out how Tsarnaev and his older brother Tamerlan put the bombs together.

"I was going through a lot of the material and speaking to people in the investigation," Miller said, "and they say 'Take a look at Inspire magazine.' There's a particular issue with an article that is now notorious in jihadi circles called 'How to make a bomb in the kitchen of your mom.' It goes through two specific devices. One is an angled pipe, capped on both ends with a lightable fuse, which is about the size of something you'd throw in your hand. I'm told that matches the pipe bombs that he was throwing as improvised hand grenades during the gun battle and that they found so many of. The other is at the bottom it says the pressure cooker bomb is the most effective device. It is to be put on the ground in a large crowd. And the recipe contained there for the pressure cooker bomb is exactly the one that they seemed to have followed based on the bomb forensics here."

According to Miller, Inspire magazine is an online publication of Al Qaeda in the Arabian Peninsula. It was published by a young man who comes from Queens, New York, moved to North Carolina and then escaped to Yemen and worked with Anwar al-Awlaki, who was Al Qaeda's recruiter and online prostelatizer.

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