It wasn't immediately clear if the roof, ceiling or balcony collapsed at the Apollo Theatre during a performance of "The Curious Incident Of The Dog In The Nighttime." Police said officers were called at around 2015 GMT (3:15 p.m. EST) to reports of a ceiling collapse at the theater on Shaftsbury Avenue in central London. Media playback is unsupported on your device Media caption The BBC's Tim Muffett was filming a different story with the London Ambulance Service when they were called to help treat the injured 
 
 The London Ambulance Service said 25 ambulance crews and an air ambulance rapid response team attended the scene. "Clearly there's been a tragedy over there tonight," the actress and broadcaster told the BBC News website. Witnesses told British media that the theater in London's famous West End was packed during the holiday season to see the show, which is based on the best-selling novel by Mark Haddon. "We thought it was part of the show, until something hit me on the head very hard," one man told the BBC, speaking from the foyer of the theater while he was being evaluated by emergency workers. Apollo Theatre The theatre is owned and operated by Nimax Theatres 
 
 It has 775 seats over four levels 
 
 Some 480 of the seats are located on the stalls dress and circle levels 
 
 The stage measures 9.2m x 8.8m 
 
 Named after the Greek god of the arts and leader of the muses, because it was designed and built as a venue for musical entertainment 
 
 The Apollo Theatre first opened its doors in February 1901 
 
 "I thought, that's not quite right, and then everything came down around us and to be quite honest I thought we were all going to be in really, really, really serious trouble and it felt horrific." We got out fairly quickly, I think everyone was quite panicked." The Apollo Theatre, named for the Greek and Roman god Apollo, god of music and the arts, was built in 1901 and has 775 seats.
– Scary reports out of London say part of the ceiling collapsed at the Apollo Theatre during a live performance. Details are still firming up, but the BBC has an estimate of four people seriously injured and another 80 or so with less serious injuries. The good news is that police say all those who were trapped have been freed, and there are no reports of fatalities. The incident took place during a packed holiday performance of the Curious Incident Of The Dog In The Night-Time. Fire officials say that as plasterwork from the ceiling collapsed, it brought down a lighting rig, too. "The entire dome roof fell down on the audience just in front of us," says one witness. "We were protected by the balcony above and we ran. People started screaming." Another tells of hearing a "strange crackling noise" just before the collapse. The theater, built in 1901, can hold about 775 people, notes the AP. "At first we thought it was part of the show," another theater-goer tells Sky News. "Then I got hit on the head." Most of those injured were described as "walking wounded" and were able to leave the theater on their own.