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Things going for it. not just the politics. it's the humanitarian crisis. not just a battlefield, it's also europe and it's also christmas. bringing together an awful lot of issues all at the same time. this is very concerning. >> and, bob, again, remarkable, so much to ask you about. so many events over just the last 24 hours around the world. investigations on the ground in ankara with russian investigators helping turkish officials looking at this policeman a 22-year-old cop, who shot and assassinated the russian ambassador there. bob's not hearing me right now. i'll put this question to ka...

The vigilance we think we have, we just don't -- at a public, a foreign event, telling you there's a sense that, that there's a safety zone. that there isn't. and that's why i mentioned, you know, attacking foreign, or domestic, officials. this has always been part of the terrorist mantra and it's now back in a big way, and it's going to raise the concerns of law enforcement around the world and so they're going to step it up a little further. >> u.s. embassy closed after man was shooting a gun outside there. obviously, that concern is around the world. karen greenburgh, and thanks to bob bair...

Expected to be wrapped up in the next few hours, and what that means on the surface, anyway, is that bashar al assad can come out and claim that his forces have retaken the entire city. an explosion likes this shows even if hiss fors on the surface have retaken the entire city, by no meaners does it mean it's safe. there may be elements inside the city that want ta cause damage. >> doing fantastic work, mohammed lila, thanks so much. back with bob and karen. karen, this playing into what we've been talking about? aleppo on the verge of falling to the syrian regime, with hezbollah and russia ba...

The man there is had in custody since last night, it's likely that he was not the driver of this truck, which means the driver at large. which mean there's is a manhunt under way. this latest incident berlin, jordan, yemen, a lot to discuss. bring in cnn intelligence security bob bair and karen greenburgh, director of center at fordham university law school. bob, german officials say they don't think they have the guy. there's a manhunt under way now in germany for whoever drove this truck into a market. tell me what you believe to be going on, on the ground right now in germany. >> well, you ...