According to the Sheriff's Department the sharks were swimming close to the surf line of the beach, and they later warned beachgoers to stay away from the water.
Long Beach's Fire Department has issued an advisory on the sharks "until further notice". He said they lingered most of the summer and then disappeared.
Video footage of the helicopter alerting the California paddle-boarders of the situation and warning them to "calmly" exit the water has gone viral.
The director at the Shark Lab in Cal State Long Beach, Chris Lowe, was studying recent shifts in the particular shark's behavior throughout Southern California.
A total of 25 great white sharks have been spotted along the coast since Monday.
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The NTSB said it found no evidence that Bostian was impaired or using a cellphone during the Washington-to-New York run. He had become aware, through radio traffic, that a nearby commuter train had been struck by a rock.
"The report we got from the sheriffs was very similar to the reports we've had before with the juveniles in the area at Beach Road", Young said.
Are northern San Diego County and the surrounding areas really a nursery for great whites? . "Within six feet of the surfer, its tail flipped and it made a circling motion around him", a lifeguard told The Orange County Register.
'Populations are coming back. Lowe said Southern California beaches have been known to be a nursery for them for at least a century. And ocean conditions may be pushing them to new places'.
This weekend, for the first time, there will be a "shark boat tour" taking off from Dana Point, just down the coast. He added that if the water temperature patterns don't return, they "might start residing here"'. The shark bit her on the right buttock and upper leg to the bone.
Even though sightings have become common, attacks are rare.