would you eat a burger grown from stem cells in lab? it might sound gross to some people. you might get the chance to find out. dan rivers in london with what s on the menu. are you taste testing? reporter: i do. this is a stem cell burger. it has been produced in lab not in a cow. it s one of only two that they made and the other one has been eaten. this is the only one in existence anywhere in the world. i better not eat it. it costs $300,000. that s an expensive burger. reporter: i m going to put it down over here because i don t
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the crowd. i spoke to the u.s. ambassador this morning, who declined a comment, saying this is being handled out of washington, but a european ambassador said this is a direct response to the attacks we saw in benghazi, libya, september 11th, 2012. the u.s. is not taking any chances. the arrests we saw here and then the jail-breaks taking place by al qaeda over the last two months leading to that interpol alert also raising concerns here. perhaps it s an overreaction, but the attitude right now, it s better safe than sorry. we had one of our producers in the area today at the u.s. embassy, and there s only a few marines protecting the facility, nobody else. let s go to dan rivers in london. reporter: thanks, john. yeah, here in london, while the u.s. is closed 22 embassies across much of north africa and the middle east and into asia, here, the uk has decided a more targeted approach. they ve just closed down the british embassy in yemen. they have issued some urgent travel advice, t
he wanted to kill. in this video you can see him and his alleged accomplice running towards the police brandishing knives, as if they deliberately waited at the scene to attack the first police who responded. the the officers who arrived were armed and shot both men. a fixture at islamist rallies like this one in london in 2007. he s understood to have converted to islam from christianity four years earlier. british of nigerian decent, he started at this school in essex, he married in 2006, a marriage which abu barra was unable to attend because he was in prison for encouraging muslims to kill british soldiers in iraq. would you condemn what he did? i would condemn the cause of this, which is the british foreign policy. at the end of the day britain has taken its people, its public to war. and it s taken its soldiers to war. and knowing full well that war,
you know, is a violent practice and people get killed in war. soldiers are, you know, in full knowledge that they could get killed. so britain is the one who is responsible. the government. and i believe all of us as a public we are responsible. we should condemn ourselves. why would we not do enough to stop these wars going on in iraq and afghanistan? but you would not condemn his actions? i would only condemn the one who is the cause of this, the aggressor, the occupier, the british government, the british troops. but it is this young soldier, drummer lee rigby who has paid the price for such extremism. cnn understands spies at the british security service mi-5 based here in central london were aware of he and his accomplice while investigating other terrorist plots, but there was nothing to indicate either men were about to strike in such an appalling way. dan rivers, cnn, london. what an awful, awful, awful