Mysterious bomb-dropping drones sank their fishing boats, survivors say. Who was behind the attacks?

By Michael Rios, Avery Schmitz, CNN (CNN) — Hernán Flores says he remembers the shock he felt when a sudden blast rocked his fishing boat in the Pacific. “We heard the explosion – boom! It was the kind of blast that left my ears ringing. Right then, I felt blood running down me,” he recounted.