A search will resume this morning for two people missing in the ocean off Coral Bay, in WA’s North West, after the boat they were on sank on Tuesday evening.

Police spokeswoman Susan Usher said two men and two women were on a 6.1 metre aluminium half cabin vessel when it capsized just after 8.30pm in the vicinity of the North Passage near Maud’s Landing.

Two of the four people managed to swim to shore and alerted bystanders that two others were still on board the overturned boat.

Water police rushed out but could not find the boat or the missing people.

A multi-agency response was launched including the local water police, the JRCC Challenger Jet, Coral Bay marine rescue and local police from Exmouth and Karratha.

The duo who made it safely to shore received medical treatment in Coral Bay.

On Wednesday morning assets from the Department of Transport and Exmouth marine rescue will join the search due to start at first light.