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 lies on a stretcher surrounded by rescue workers, awaiting evacuation after part of the ceiling collapsed during a performance at the Apollo Theatre, Shaftesbury Avenue, London, Dec. 19, 2013.

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A woman receives medical attention after part of the ceiling collapsed at the Apollo Theatre, Shaftesbury Avenue, London, Dec. 19, 2013.

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People receive medical attention after part of the ceiling collapsed at the Apollo Theatre, Shaftesbury Avenue, London, Dec. 19, 2013.

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An injured person is wheeled out of a theater used as a makeshift treatment center for the nearby Apollo Theatre after part of its ceiling collapsed, London, Dec. 19, 2013.