'Killing on a huge scale' in Nigerian town of Baga

Satellite images of Nigerian towns attacked by Boko Haram show widespread destruction and suggest a high death toll, according to human rights group Amnesty International.

They show some 3,700 structures damaged or destroyed in Baga and Doron Baga last week.

Nigeria's government has disputed reports that as many as 2,000 were killed - but Amnesty cited witnesses saying that militants had killed indiscriminately.

James Robbins reports.