Dolphin Killer on the Loose in Gulf Coast

A serial killer targeting dolphins has many on edge.
3:00 | 11/19/12

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Transcript for Dolphin Killer on the Loose in Gulf Coast
the growing mystery on the gulf coast. There's a serial killer on the loose after going after dolphins. It's getting a lot of people on edge right now. And abc's john schriffen has the story. Reporter: This morning, investigators along the gulf coast are trying to figure out who is responsible for mutilating and killing dolphins, after a string of disturbing attacks here. The manuals with bullets in them. We have seen animals with their tails cut off. Animals with their jaws cut off. So it's really heartbreaking to see such violence. Reporter: This man, one of the lead investigators says recently authorities have found four dolphins either floating in the water or washed up on beaches in louisiana, mississippi and alabama, including one found just days ago. What kind of a person would do this? No normal person would kill senselessly and then mutilate it. I mean, this is kind of something you hear in horror stories. Reporter: The animals have been brought here tohe institute for marine mammal studies in gulfport, mississippi. Investigators hope autopsies willermine how the dolphins died and whether they were tortured first. Hey! Reporter: What makes it even more incomprehensible to scientists is that dolphins pose no threat to us. A rub, a nice little belly rub for him. Reporter: Dolphins are highly intelligent, second only to people but they're also a very accepting species. They just love human interaction. Reporter: And that has people concerned. They say whoever is doing the attacks are taking advantage of the instincts. We have somebody using them as target practice. And the penalty for killing a dolphin is a fine up to $100,000 and a maximum one year in jail. But experts say it's biggest fear right now, because investigators are still peegs this together, is that there are more dead dolphins throughout they just haven't found yet.

This transcript has been automatically generated and may not be 100% accurate.

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