Is crude oil killing Nigerian children?

Nigeria has hundreds of oil spills every year, many of them on land that people have to farm, work and live on.

New research by scientists at the University of St Gallen in Switzerland says these spills could be causing the deaths of young children.

The BBC went to the Niger Delta to meet some of the families living in a town surrounded by spills.

Video journalists: Stephanie Hegarty and Ayo Bello