Al - terrorism footage shows militants coldly attacking civilians with machine guns . footage shows graphic aerial shots of the dead bodies floating in the water . The victims all appear to be young unarmed men , captured near the Somali coast .
Al-Shabaab video shows militants coldly executing civilians with machine guns . Video shows graphic closeup footage of the dead bodies floating in the water . The victims all appear to be young unarmed men , captured near the Somali coast .