Soldiers from Niger and Chad who liberated the Nigerian town of Damasak from Boko Haram militants have discovered the bodies of at least 70 people, many with their throats slit, scattered under a bridge, a witness said.

In what appeared to be an execution site for the Islamist group, the bodies were strewn beneath the concrete bridge on one of the main roads leading out of the town. At least one was decapitated.

The bodies were partially mummified by the dry desert air, while grass has began to grow around the corpses, suggesting that the killings had taken place some time ago.