Beachgoers on Alert As Sharks Spotted Lurking Around Both Coasts

Video caught six sharks in the waters of Southern California and a massive great white has been spotted near New York.
2:23 | 05/15/15

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Transcript for Beachgoers on Alert As Sharks Spotted Lurking Around Both Coasts
Now to the alert for anyone heading to the beaches this weekend. Sharks spotting along both coasts. Six of them off the waters in southern California there. And that massive great white, hanging out near New York. Gio Benitez is in rockaway beach, New York, this morning. Reporter: Shark attacks are rare. They do happen. Beaches from coast to coast are putting swimmers on high alert. Be ware the great white. This morning, scare in the water. This shocking sight caught off the coast of a popular southern California surf spot. Marine experts say that is a juvenile great white, swimming alongside a sheriff's booed this week. That shark wasn't alone. At least six more in the water. Some up to six feet long. Just two weeks ago, another swim at your own risk alert after these go juvenile great whites were seen swimming off the same surf line. This is the first time in 25 years a confirmed shiiting of a white shark. Reporter: Experts say young great whites are often harmless. Hey, get out of the water! Shark! If a swimmer gets too close, the dapger can be very real. Just hear everything crunch. Reporter: Just up the coast, a 7 to 8-foot juvenile attacked. So far this year, eight shark attacks. One of them in maui, fatal. Now as the weather heats up, beachgoers on both coasts are on high alert. The 16-foot 3500-pound geo-tagged shark known as Mary lee has been cruising New York and New Jersey shorelines for weeks. And that great white, Mary lee, was spotted just off this coast here a couple of days ago. I want to show you how big she is. From where I'm standing to the edge of these rocks here, that's how big Mary lee is. About 16 feet. Research ears were shocked by her size. And she has her own Twitter account, too. 40,000 followers. Big news here and around the world. Let's turn to "Gma" weekend

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

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