The port at Picton, including the ferry terminals and the surrounding industrial area, has been evacuated due to a gas leak.

KiwiRail has confirmed an LPG gas leak was detected on a train wagon in a yard at the port soon after 6am.

Fire and Emergency says two crews from Picton arrived first on scene, while crews from Blenheim and a Hazmat truck from Nelson have also been called in.

It is unclear whether there is any ongoing danger to the public.

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Police have confirmed cordons are in place around the port, and several nearby streets.

A KiwiRail spokesman is warning Cook Strait ferry passengers to expect delays to services as the incident is resolved.