Police detained the owner and manager of a Casablanca mattress factory that went up in flames, killing at least 55 people, a police official said amid accusations of poor safety standards and locked doors that trapped workers... Factory owner Adil Moufareh and his son Abdelali, the plant manager, were detained for questioning…[S]ome factory workers…said the owners had locked the doors, apparently to prevent the fire from spreading and save their merchandise...A senior police official on the scene said the owner had denied the allegations…Interior Minister Chakib Benmoussa said an investigation into the cause of the blaze would also examine security measures and work conditions at the factory. [the factory's name is Rosamor Furniture (AFP)]