Sarah-Beth Casey, who had three small children with her in her apartment, saw the immediate aftermath of the helicopter crash.
When I heard the explosion - it was like a little earthquake. It was like a gas explosion. I looked up to see debris falling off the tower. I can't see any people on the ground, it seems to be a lucky escape. The police and ambulance response was incredible.
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The figure does not include millions of people watching the debate online, or the countless others watching in pubs and bars.