An area of Napier Port has been cordoned off while firefighters deal with a chemical spill.

A small amount of sodium hydroxide, or caustic soda, has been found outside a container.

Three fire trucks, along with a combined hazardous materials unit and command centre were sent to the port at 8.20am.

Fire Service spokesman Mike Wanoa said there was no danger to the public because a secure area of the port was blocked off.

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He said fire crews were decontaminating the area where the spill happened.