Eyewitness Hithem Ben Abdallah, 56, was in a cafe next door to the library shortly after 1pm when he heard screaming and went outside.
"There was a guy who was being very brave and another guy with a white baseball cap who he was trying to control and the man in the baseball cap suddenly pulled a gun from his bag".
After a brief scuffle, he said the man stepped back and the MP became involved.
Mr Abdallah said the weapon had "looked handmade" and a man who had been wrestling with the gunman continued even after seeing the gun.
He said: "The man stepped back with the gun and fired it and then he fired a second shot, as he was firing he was looking down at the ground."
http://www.bbc.co.uk/news/uk-england-36550304
Who did you think it would turn out to be Thrice?