Fifteen people were injured in an explosion during the rehearsal of the musical "1789, Lovers of the Bastille" in Paris on Friday, just hours before the show, local media reported. Five people were seriously injured, local newspaper "Le Parisien" said on its website. The explosion took place around 6 p.m. local time at the Palais des Sports in the fifteenth arrondissement, near the Porte de Versailles. According to preliminary investigations, the accident occurred when a worker used a grinder near a box containing pyrotechnics. The report said technicians and artists were injured during the explosion. "The walls shook," said an employee of the theater.