More than 60 firefighters were fighting to control a fire that started aboard a cargo ship earlier.
Hampshire Fire and Rescue Service was called to Western Docks at about 14:00 BST when a fire started in the hold of the Sirina, a bulk carrier. It was sitting in a dry dock and loaded with about 28,000 tonnes of scrap metal at the time of fire.
No casualties reported
Everyone has been accounted for and South Central Ambulance Service said no casualties have been reported.
Residents in Millbrook and Marchwood have been advised to keep windows closed due to the amount of smoke in the air.
Tough fire to put off
At about 20:00 a spokesman for the fire service said about 60 firefighters remained at Western Docks tackling the fire, along with personnel from the coastguard and other agencies.
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Source: BBC