Emergency services in Essex said they had been called to Industrial Chemicals Limited, Stoness Road, in West Thurrock.
Fire crews found there had been an explosion of chemicals in a chlorine scrubbing unit.
More top news
Sean Cox is being treated for his injuries at Walton Neurological Centre, where his condition is described as critical.
The bank’s chief executive Paul Pester said he was ‘truly sorry’ for the ongoing problems.
'By the middle of the century, quarter of the population, will be obese,' Hugh Fearnley-Whittingstall, celebrity chef and campaigner said.