Part of a roof in the Apollo Theatre in central London has collapsed during a performance.
The theatre in Shaftesbury Avenue was packed for a performance of the Curious Incident Of The Dog in the Night-time.
An eyewitness said she heard "a crackling" noise before the collapse at about 20:15 GMT. Another eyewitness said the "entire dome roof" fell on audience members seated in the stalls.
The Metropolitan Police said they were "aware of a number of casualties".
London Fire Brigade eight fire engines were attending.
