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People sit aboard a London bus used for casualties following a ceiling collapse at a theatre in Central London on December 19, 2013. The ceiling of a top London theatre collapsed on the audience during a performance Thursday, causing what police said was an unknown number of casualties and leaving terrified theatregoers covered in blood and dust. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561689 )

Police and emergency services personnel assist in operations behind a cordon following a ceiling collapse at a theatre in Central London on December 19, 2013. The ceiling of a top London theatre collapsed on the audience during a performance Thursday, causing what police said was an unknown number of casualties and leaving terrified theatergoers covered in blood and dust. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561651 )

Emergency services attend the scene at the Apollo Theatre in Shaftesbury Avenue, central London, Thursday, Dec. 19, 2013. A theater in central London partially collapsed Thursday night during a performance at the height of the Christmas season, with police saying there were "a number" of casualties. (AP Photo/PA, Dominic Lipinski) ( Britain Theater Collapse )

Police and emergency services personnel assist in operations behind a cordon following a ceiling collapse at a theatre in Central London on December 19, 2013. The ceiling of a top London theatre collapsed on the audience during a performance Thursday, causing what police said was an unknown number of casualties and leaving terrified theatergoers covered in blood and dust. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561609 )

Police and emergency services personnel assist in operations behind a cordon following a ceiling collapse at a theatre in Central London on December 19, 2013. The ceiling of a top London theatre collapsed on the audience during a performance Thursday, causing what police said was an unknown number of casualties and leaving terrified theatergoers covered in blood and dust. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561648 )

Police and emergency services personnel assist in operations behind a cordon following a ceiling collapse at a theatre in Central London on December 19, 2013. The ceiling of a top London theatre collapsed on the audience during a performance Thursday, causing what police said was an unknown number of casualties and leaving terrified theatergoers covered in blood and dust. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561614 )

Police and emergency services personnel assist in operations behind a cordon following a ceiling collapse at a theatre in Central London on December 19, 2013. The ceiling of a top London theatre collapsed on the audience during a performance Thursday, causing what police said was an unknown number of casualties and leaving terrified theatergoers covered in blood and dust. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561630 )

This image taken from television shows emergency services attending an incident at the Apollo Theatre, illuminated at rear right, in London's Shaftesbury Avenue, Thursday evening, Dec. 19, 2013, during a performance at the height of the Christmas season, with police saying there were "a number" of casualties. It wasn't immediately clear if the roof, ceiling or balcony collapsed during a performance. Police said they "are aware of a number of casualties," but had no further details. (AP Photo/Sky News) UNITED KINGDOM OUT, TV OUT ( Britain Theater Collapse )

Rescue services at the scene of an apparent balcony collapse at the Apollo Theatre in London, Britain, 19 December 2013. 20 to 40 people were injured according to first estimates by authorities. EPA/ANDY RAIN ( BRITAIN APOLLO THEATRE INCIDENT )

The Apollo Theatre on Shaftsbury Avenue, the scene of an incident where a balcony collapsed in London, Britain, 19 December 2013. 20 to 40 people were injured according to first estimates by authorities. EPA/ANDY RAIN ( BRITAIN APOLLO THEATRE INCIDENT )

Police and rescue services at the scene of an apparent balcony collapse at the Apollo Theatre on Shaftsbury Avenue in London, Britain, 19 December 2013. 20 to 40 people were injured according to first estimates by authorities. EPA/ANDY RAIN ( BRITAIN APOLLO THEATRE INCODENT )

Shocked and injured theatergoers are transported to hospital in a commandeered London bus following an incident during a performance at the Apollo Theatre, in London's Shaftesbury Avenue, Thursday evening, Dec. 19, 2013. It wasn't immediately clear which part of the building had collapsed. The London Fire Brigade said the theatre was almost full, with around 700 people watching the show. A spokesman said it was thought between 20 and 40 people were injured. (AP Photo by Joel Ryan, Invision) ( Britain Theater Collapse )

A woman lies on a stretcher surrounded by rescue workers, awaiting evacuation following an incident during a performance at the Apollo Theatre, in London's Shaftesbury Avenue, Thursday evening, Dec. 19, 2013, with police saying there were "a number" of casualties. It wasn't immediately clear which part of the building had collapsed. The London Fire Brigade said the theatre was almost full, with around 700 people watching the performance. A spokesman added: "It's thought between 20 and 40 people were injured." (AP Photo by Joel Ryan, Invision) ( Britain Theater Collapse )

Emergency service vehicles gathered among London buses following an incident during a performance at the Apollo Theatre, far right, in London's Shaftesbury Avenue, Thursday evening, Dec. 19, 2013. (AP Photo by Joel Ryan, Invision) ( Britain Theater Collapse )

Injured people sit wrapped in emergency blankets on a London bus used for casualties follwing a ceiling collapse at a theatre in Central London on December 19, 2013. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561856 )

Injured people sit wrapped in emergency blankets sit on a London bus used for casualties following a ceiling collapse at a theatre in Central London on December 19, 2013. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561908 )

Injured people sit wrapped in emergency blankets on a London bus used for casualties following a ceiling collapse at a theatre in Central London on December 19, 2013. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561920 )

Injured people sit wrapped in emergency blankets on a London bus used for casualties follwing a ceiling collapse at a theatre in Central London on December 19, 2013. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525561960 )

An injured woman is taken towards a waiting ambulance on a stretcher following a ceiling collapse at a theatre in Central London on December 19, 2013. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525562034 )

An injured woman cries inside an ambulance following a ceiling collapse at a theatre in Central London on December 19, 2013. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525562065 )

An injured man is treated inside an ambulance following a ceiling collapse at a theatre in Central London on December 19, 2013. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525562130 )

Emergency services personnel assemble behind a cordon following a ceiling collapse at a theatre in Central London on December 19, 2013. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 525562164 )

A man wraps himself in an emergency foil blanket provided by rescue services following an incident at the Apollo Theatre, in London's Shaftesbury Avenue, Thursday evening, Dec. 19, 2013 during a performance , with police saying there were "a number" of casualties. (AP Photo by Joel Ryan, Invision) ( Britain Theater Collapse )

A bandaged man comforts a woman following an incident at the Apollo Theatre, in London's Shaftesbury Avenue, Thursday evening, Dec. 19, 2013, during a performance , with police saying there were "a number" of casualties. (AP Photo by Joel Ryan, Invision) ( Britain Theater Collapse )