we'll try to get that to you. it seems to show people lying injured on the road, on the westminster bridge. that's what you're looking at. we're looking at activity on the left side of the screen. that's the west minister bridge. the narrative seems to be that something happened there, a car hit some people and then went into the side of the bridge. after that, someone ran toward parliament. was told to stop. we're just piecing this together based on eyewitness testimony we've gotten on this. somebody ran toward parliament. police came out and told that person to stop. apparently they didn't stop and they were shot. we've heard everything from one, two to four shots poll malcolm nance did point out in a closed environment, gunshots echo so it's not clear that what you hear is what actually happened. let's go to security analyst duncan graham in london. you have had, i guess, the same chance to piece some of this together. what do you make of it? >> well, knowing the geography a