Update 21:40hrs: Firefighters have gained entry to the trailer. There is no obvious leak.
Update 21:57hrs: Crews used one thermal imaging camera to check for hot spots. Incident scene left with port authority.
ESSEX Firefighters wearing breathing apparatus have been called to a chemical incident in at the Port of Tilbury.
Crew members at the incident scene report a strong chemical smell coming from a trailer.
The area has been cordonned off by 100m. Crews are working with port staff.