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Explosion. starkly contrasting a report from a russian state news agency saying none of the recovered bodies of passengers show evidence of explosive impact. tonight, cnn has learned, despite that report, u.s. government experts still aren't ruling out the possibility of a bomb on board. even as they weigh other scenarios. >> what could cause a catastrophic event. >> many things. history of fatigue cracks discovered after maintenance repairs have been done, planes where the skin has disintegrated flying over oceanic routes than catastrophic failure, issues about cargo hold, issues on engines. ...

Right. >> somewhat encouraging. the problem i have with it is, we're accepting the russian presence. by the way, the russians are not bombing isis there. if they do, it's window dressing. they're bombing moderatesing people that want to live in a free syria. by us coordinating with them and accepting them we're allowing strong combat. by the way, they're bombing hospitals and medical facilities, innocent people. we're accepting there's an air power against the freedom loving people of syria and it's tragic. >> thanks for coming in. coming up, there's breaking political news following. a within...

That have it easy. >> hillary clinton, no tough questions. i mean, why didn't they ask about bill. why didn't they ask about all of the different things? hillary had only softballs all night long. it was like this. here, hillary, hit this one over the park. >> reporter: now, it's worth remembering that in 2007, president obama, hillary clinton and john edwards all decided to skip a debate that was hosted by fox news, so it's clear that complaints about debates really do work across the aisle. wolf? >> thanks very much, sara, for that report. let's bring in senior political reporter nia-malika ...

Video, isis is again claiming credit for downing the commercial airliner, calling russian leader vladimir putin a pig and warning he will pay a "high price for his actions in syria." the group offered no proof, and intelligence analysts tell cnn they don't find the claim credible, but sources say the u.s. has not ruled out the possibility of terror. several competing groups had threatened putin since russian troops began pouring into syria, something secretary of state john kerry warned in a recent interview with cnn might happen. >> if he's going to side with assad and with iran and hezbollah...

Inside obama's post 9/11 presidency." we're also joined by cnn terrorism analyst. thanks for joining us. charlie, i want your take on the plane crash. isis, al qaeda, they're warning of retaliation against the russians for air strikes in syria. you've covered this region extensively. how likely do you believe it could be that some terror group, whether al qaeda or isis or some other terror group, specifically attacked this plane for retaliation against the russians? >> well, you know, wolf, i don't want to speculate without more evidence. we want to see what on those black boxes, but obviously...