MOSUL, Iraq—As they advance into Islamic State’s remaining urban stronghold of west Mosul, Iraqi forces are struggling to counter the terror caused by the militant group’s drones.
Iraqi forces have grown accustomed to enemy drones flying over the battlefield since Islamic State seized swaths of the country in 2014. They have used rifle fire and high-tech gadgets to counter them, and even have drones of their own.
But the militants have fine-tuned their drone technology. What were once jerry-rigged, remote-controlled aircraft resembling model planes are now commercially available quadcopters—drones with four helicopter-like blades—that have been retrofitted to carry grenades that can be dropped over targets.
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