Some communities in Boko Haram areas have seen all their toddlers die, says UN

More than half a million children in the west African area wracked by Boko Haram extremists are so malnourished their lives could be in danger unless they get aid, a UN humanitarian official has said.

Toby Lanzer, the UN's humanitarian co-ordinator for the area, described a region where millions get by on one meal a day and some communities have lost all their toddlers.