Investigators in London are trying to figure out why part of the ceiling of a theater collapsed mid-performance Thursday, injuring at least 88 people at a nearly sold-out show.
London Theater Collapse

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A woman walks, bandaged and wearing a blanket given by emergency services, following the partial collapse of the ceiling at the Apollo Theatre during a performance at the height of the Christmas season, Shaftesbury Avenue, central London, Dec. 19, 2013.

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Emergency services look at the roof of the Apollo Theatre after part of the ceiling collapsed, Shaftesbury Avenue, London, Dec. 19, 2013.

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A bandaged man comforts a woman after part of the ceiling collapsed at the Apollo Theatre, Shaftesbury Avenue, London, Dec. 19, 2013.

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A man wraps himself in an emergency foil blanket provided by rescue services after part of the ceiling collapsed during a performance at the Apollo Theatre, Shaftesbury Avenue, London, Dec. 19, 2013.