Satellite images show widespread destruction in two Nigerian towns that were recently attacked by Islamic extremists, an international human rights group has said.
The detailed images of Baga and Doron Gowon (aka Doro Baga), taken before and after the attack earlier this month, show that more than 3,700 structures were damaged or completely destroyed, Amnesty International said.
Amnesty said the images were taken on January 2 and January 7.
Boko Haram fighters seized a military base in Baga on January 3 and, according to witnesses, killed numerous civilians in the ensuing days.
The Nigerian military cites a figure of 150 dead, including killed militants.
Amnesty International said interviews with witnesses and others suggest hundreds of civilians were shot; last week, the human rights group noted reports of as many as 2,000 dead.
Daniel Eyre, Nigeria researcher for the human rights group, said in a statement that the assault on the two towns was the largest and most destructive of all the Boko Haram assaults analysed by Amnesty International.
Nigeria's home-grown Boko Haram group drew international condemnation when its fighters kidnapped 276 schoolgirls from a boarding school in north-east Chibok town last year.
Dozens escaped but 219 remain missing.