Tonga tsunami has destroyed all houses on Mango Island
In Tonga, where the UN says 84,000 people, more than 80% of the population, have been badly affected by an undersea volcanic eruption and subsequent tsunami. The UN has called access to safe water Tonga's "biggest life-saving issue." The disaster in Tonga has destroyed all houses on Mango Island. Properties on the country's main island are also severely damaged. Owen Poland reports from New Zealand.