The video, which has gone viral due to the shocking footage, shows the huge killer animals advancing on people wake boarding in the surf at a beach on Orange County, California.
The six-foot long aquatic predators can be seen swimming with purpose towards the shore line.
They are unusually close to the coastline causing extreme alarm.
The police issue a demand from the helicopter for beach-goers to get far away from the sharks.
“This is the Orange County Sheriff Department,” the police announced.
“Be advised State Parks is asking us to make an announcement to let yo know you are paddle-boarding next to approximately 15 great white sharks.”
Hovering above the coastline, viewers can clearly see the dark shape of the sharks moving in the water, where people are surfing.
The police continue: “They are advising that you exit the water in a calm manner. The sharks are as close as the surf line.”
A crowd of about 30 people, around six of whom are children, stand and watch from the shore line. The incident took place near Dana Point.
There is a warning issued in the area currently after a 35-year-old woman was bitten by a shark off San Onofre State Beach on April 29.
It is not known why the sharks chose to advance in these waters.
However, Surfer Today has advised their readers: “Sharks smell and taste blood from a long distance, so people with open cuts and menstruating women should stay out of the water in areas known for regular attacks.
“Surfers catching waves after it rains, or in fishing and sewage-affected areas, carry a higher risk of being attacked by sharks.
“Contrasting colours in surfboards, wetsuits, and board shorts, and shiny jewellery are also not a good idea.”
Another terrifying beast chases travellers in footage found online.
A viral video showing the terrifying moment when a cyclist gets chased by a wild bear while riding through Slovakia has wowed viewers on Youtube.
