Particularly striking were all those images from inside the Tube trains or tunnels when one imagines people had other things on their mind than "getting one for the album". What impels people to do this when surely their only thought would be about getting out? Is it a desire to prove they were there? Even more puzzling are those pictures of the bus blast, seemingly taken within seconds of the explosion. Apparently, somewhere between the compulsion to go and help and the less noble but equally understandable compulsion to flee is the compulsion to stop and take photos.