Sangfroid indeed, from the CBC website http://www.cbc.ca/story/world/national/2005/07/21/london-050721.html;
"At the Oval station, the BBC said a man was seen with some kind of device that went off, emitting smoke. Several people chased the man as he left the station and followed him as he ran into a park, the BBC report said. Police then cordoned off the area."
PC
N P Childs
'I'm Mister Bad Example, the stranger in the dirt, I like to have a good time and I don't care who gets hurt'.
-Mr. Bad Example, W Zevon