A search has resumed for two fishermen whose boat capsized near Fiordland yesterday.
The search and rescue fleet, including three boats and two helicopters equipped with night-vision goggles and thermal imaging equipment, failed to find any sign of the two missing men last night.
The alarm was raised at 5pm when a fishing vessel came across a fuel slick near the mouth of Milford Sound.
Ninety minutes later, an inflated life raft was located drifting 12km southwest of the oil slick.
A life ring and some other items have also been located.
Last night, three fishing vessels continued the search. A Coastguard fixed-wing aircraft from Invercargill was to join the search this morning.
The name of the vessel and the identity of the two persons believed to be onboard will not be released until next of kin are informed.