With the bright blue sky and warm autumn sun, for a bizarre moment I remember thinking it looked more like a scene from a college brochure than the evacuation of a building under attack.

BBC: Remembering the Pentagon attack

"I was smoking outside the door when I looked up at the sky and suddenly the sky lit up with a bright light and something that looked like the sun fell somewhere to the south of Yekaterinburg, " wrote Sergei Bobunets, quoted by AFP news agency.

BBC: Russia meteor eyewitness: 'Something like the sun fell'