A 80m ship on fire that is "well involved" at Timaru's port has prompted a large Fire and Emergency response.

10 fire trucks are attending the fire in the South Canterbury town's port.

Three crew members of the ship have been treated for smoke inhalation.

A Timaru District Council webcam shows a large amount of smoke coming from the port.

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Fire crews were first alerted to the fire at 9.30pm.

The ship is understood to be a fishing vessel.

Police are also at the blaze.

Three ambulances are also at the scene and dozens of onlookers are watching the scene unfold.

More to come