London police are reporting casualties:

Twitchy will update this post with additional details.

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This tweeter says it was part of the ceiling, not the balcony, that collapsed [editor’s note: we have updated our headline accordingly].

There are reports that people are trapped underneath the collapsed ceiling or balcony:

Horrible.

Wounded people are reportedly being taken to a nearby theater for medical treatment:

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An eyewitness report?

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Details are still scant. Some reports contradict each other:

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A photographer captures the scene at the Gielgud theatre, where wounded people are being treated:

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More photos:

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The photo above was taken tweeted by a Features writer for The Independent [editor’s note: we aren’t sure who took the photo];  he was in the theatre when the ceiling or balcony collapsed:

https://twitter.com/susborne/status/413769861383610368