A writer who was at London's Apollo Theatre when the ceiling collapsed said he saw "a lot of kids traumatised, covered in dust and blood being comforted by parents".
The Independent features writer Simon Usborne told Daybreak: "There were screams, it was immediately clear something serious had happened.
"Nobody told anyone to move - everybody rose immediately and ran to the nearest exit".
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The decision was made after two Russian athletes failed drugs tests at the PyeongChang Games.