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Difficulty in protecting. >> yeah, absolutely. and music venues themselves are something that terrorist groups in the past have liked to target. you may remember there was a suicide bombing at a music festival in germany last summer. the vatican in paris very specifically targeted by isis. there was a plot back in 2004 to attack in london. so because of the conditions you correctly laid out, it makes it an appealing target for terrorists because you've got high concentration of people, very hard to protect from the kind of attack of people leaving exits and leaving all together at one time, ve...

Into europe, but they're investigating that possibility right now. not clear when he came back through the greek island, but in order for him to get back to europe, he presumably would have had to do that illegally in some kind of fashion because he was one of the most wanted men in europe because of his suspected role in that plot back in belgium in january to launch a major gun and bomb attack in the country. this is new, fresh information coming from a source close to the investigation in paris. >> paul cruickshank reporting, thank you. still to come in the "newsroom" -- russia's high-tec...

Good to have you. >> ainsley: thanks. whereships are now on the move to syria. [chanting] this comes as scores of syrians are protesting the government's apparent use of those chemical weapons. the warships could be used for a cruise miflt strike but president obama's down playing intervention without a mandate from the u.n. and mystery solved. we now know where ambassador samantha power was when there was that emergency u.n. meeting about syria. she was on a personal trip to ireland. power missing that meeting just 19 days after she assumed the post with the u.n. also new overnight, the terro...