The HSE has said that it is looking into two explosions at the plant caused by pipes over-pressurising and bursting. There were “no flames, just steam”, a spokesperson said.
ExxonMobil temporarily closed the plant on 12 August and has said it will not reopen before November. It is carrying out its own investigation into the explosions.
Stuart Neill, external affairs manager for ExxonMobil, said: “We are concerned that comments have been made publicly on an ongoing regulatory investigation.