An explosion at the Palais des Sports arena in Paris has injured 15 people, five of them seriously.
Firefighters say they believe the incident at was caused by a pyrotechnic device accidentally blowing up.
It happened during a rehearsal for the musical comedy “1789: The Lovers of the Bastille” at around 18:00 local time.
Part of the set collapsed wounding technicians and performers. The explosion was so loud that a dozen people reportedly had to be treated for aural trauma.
An investigation has been launched into what exactly went wrong.