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
Events company Secret Cinema is planning to screen a film in protest at what they have called the 'censorship' of The Interview.
Sepp Blatter's £19 million attempt to immortalise Fifa on screen could do with a sequel. How about The Untouchables or The Usual Suspects?
Some of the children at the Royal Free Hospital in London were less than impressed with their visit from Alex Oxlade-Chamberlain.