Photos taken in Mosul, Iraq, appear to show grenade-dropping drones used against the Iraqi security forces.  The improvised weapons consist of a plastic tube attached to a consumer camera drone to carry explosives.

The images were taken by former US Army special forces officer Mitch Utterback, who was in the country as a journalist.  Last week a US Army commander said so-called Islamic State fighters were using such weapons as they tried to avoid losing control of the city.

Read more: BBC News