Health and safety chiefs have been given eight weeks to explain to the Government "serious failings" in the years leading up to a factory blast in Glasgow which killed nine people.
An official inquiry report into the explosion at the ICL plastics factory five years ago was published and found it was an "avoidable disaster".
Families of the dead called for an overhaul of safety regimes and for "lessons to be learned" and inquiry chairman Lord Gill said risks posed were "not identified and not understood" at the factory.