Essex police urged people who live around West Thurrock to stay indoors due to the chemical smell after an explosion at a factory.
Police are asking that anyone who lives in the area stay indoors and keeps their windows and doors closed.
There are reports of a strong chlorine smell in the area.
More top news
A manhunt is being undertaken after two men were shot - one fatally - at a residential site on Thursday evening.
Residents of Fort McMurray were restricted to salvaging only their clothes and pets as they were evacuated.
Warm sunshine to end the working week