Group of Chibok schoolgirls 'freed'

It is thought that they are now with the security services in the north-eastern city of Maiduguri.

It is not yet clear how the girls were rescued.

The Islamist militant group kidnapped more than 250 students from a school in Chibok in April 2014 - an act that provoked international condemnation.

This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version.

If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts.