Firemen confer at the scene following an incident at the Apollo Theatre, in London&amp;#39;s Shaftesbury Avenue, Thursday evening, Dec. 19, 2013, during a performance at the height of the Christmas season, with police saying there were &amp;quot;a number&amp;quot; of casualties. It wasn&amp;#39;t immediately clear if the roof, ceiling or balcony had collapsed  during a performance. Police said they &amp;quot;are aware of a number of casualties,&amp;quot; but had no further details. (AP Photo by Joel Ryan, Invision)