john zilkha is still with me.here was obviously a lot of mobile phone footage filmed by people can you talk me through what you decided to use and show, and what did you decide not to? obviously, in situations like this, such a horrific case, we have to exercise great care in the footage we show. we have an awful lot of footage and images available to us. we take the view that the footage we would use would have to enhance and amplify our storytelling in some way. our first duty in these situations is to tell the story, to report the news. it is a balance between reporting those facts, to explain to people what has happened, and as far as we can, why and how it has happened, and not to cause unjustifiable distress. i think the use of these images in this particular case allowed us to tell the story that was a particularly dramatic one, an obviously horrific event, but in a way that was sensitive and told people of the difficulties and chaos that ensued. just for people to understand, you choose stuff that maybe do