bum vest on and so we cleared house and got out of the way. >> usman khan and his previous terror events, he is pakistani by origin and was 19 when he was arrested with eight others for a plot to bomb london's stock exchange. this was back in 2010. his original sentence was reduced partly because he pled guilty. khan was released in prison in 2018 on license, which is a form of strict parole to serve out the second half of his sentence from home. with us now from london is terrorism expert sargin gomel. always good to see you, sir. the interesting thing here, police were on the scene so very quickly, but the whole incident does speak to the effectiveness of these low tech attacks, if