Great White Sharks Spotted Near Popular Beaches

Authorities force swimmers out of the water at some of U.S.'s most visited beaches.
3:00 | 09/03/12

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Transcript for Great White Sharks Spotted Near Popular Beaches
Now to growing concerns about shark attacks. Authorities are forcing swimmers out of the water at some of the country's most popular beaches. That's why. Great whites spotted close to shore. John schriffen is here with the latest. That's scary. Reporter: All summer, scientists have been tracking the movement of sharks off the new england coast. They've been coming closer and closer to shore. These are not just any sharks. They're great whites. One of the most powerful predators in the ocean. As great white sharks like this one swarm the beaches of cape cod, normally packed with swimmers on labor day weekend, officials are ordering everyone out of the water. They were definitely very close. We just keep everybody safe and keep' them out of the water. Reporter: Peter took his family on a whale-watching trip. What they found was not a whale. My daughter spotted a fin off in the distance. As we got closer, it was clear it was a shark. We thought the shark would come up from under the boat. Reporter: The shark was more concerned with its lunch. The massive predator tore a seal to pieces. The shark is just feet from their boat. Oh, my god. Reporter: Throughout new england, it's been a real-life shark week. Dozens of great whites have been spotted across the region's beaches. On the border of massachusetts and rhode island, this 13-footer washed up on shore and quickly drew a crowd. That's awesome! Reporter: -- Eager for a look up close at this animal. He's zostone dead. But he's got jaws written all over it. Reporter: This man has been tracking the shark population for four years. He says the shark sightings have spiked because of the exploding seal population over the last few years. And that swimmers should be on the lookout. Don't swim near the seals. If they appear startled, that's a good ind daicator that a shark is in the area. Reporter: The best way to stay safe is to stay near a life guard tower. They can see the fin in the distance. Let's get a check on the weather today.

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

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