The death toll from last week's earthquake and tsunami in the Solomon Islands has risen to 40.

The National Disaster Management Office revised the toll upward after the discovery of a two-year-old boy's body.

Prime Minister Manasseh Sogavare has announced that Friday will be a day of mourning following the 8.0-magnitude quake and tsunami that hit on 2 April.

Aid continued to pour into the Solomon Islands over the weekend with new supplies arriving from Australia, New Zealand, New Caledonia and Japan but some remote areas are still waiting for aid to reach them.

Up to 7,000 people were left homeless by the disaster and many more living in low-lying areas are afraid to return home from hill camps because of fears of another tsunami.