Nick Harding from London Fire Brigade said the audience at the Apollo Theatre were walking around in a dazed condition after the ceiling collapsed.
The Kingsland Fire Station manager said, "People were in a lot of shock ... a lot of them had head injuries and other injuries so it was quite a confused scene."
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The Food Standards Agency said the product can be returned "from where it was bought for a full refund."
The car giant said it would cut 1,160 jobs at the plant in Bridgend.
Rain and wind clearing tomorrow, leaving a drier and brighter day behind.