Cape Cod, peninsula of the US state of Massachusetts, closed to swimmers after dozens of great white sharks were spotted over the weekend.

The shark sightings were reported thanks to the app Sharktivity, which was created by the Atlantic White Shark Conservancy.

Here’s everything we know about the reports, as well more details about the application.

Photo by JOSEPH PREZIOSO/AFP via Getty Images

Cape Cod closes after dozens of white sharks spotted

Swimmers at Cape Cod will need to find a new spot this summer after dozens of great white sharks were seen in one weekend.

According to the Sharktivity app, six great white sharks were spotted on Saturday, while another 17 sightings were reported on Sunday.

The app alerts social media users of real-time shark sightings with locations. Users can use the app to receive alerts about sightings, check out where sharks have been seen and report their own sightings.

For more information about the application, you can visit its official Twitter handle.

Where were they spotted?

According to users’ activity, a great white shark sighting was reported about 20 yards from North Beach Island. Another shark sighting was logged near the same beach an hour before that.

In the same day, seven other sightings were detected near a buoy close to North Beach Island.

A Twitter user uploaded screenshots of several sharks which were detected by the app in the same day. Some of the sharks were called Snoop Dogg, Camden, Spot Claw, among others.

Facts about great white sharks

Great white sharks are the largest known predatory sharks living in our oceans. They have been a topic of interest in many documentaries, movies and television series.

The average size of one shark is about 11.4-15 feet (3.5-4.6 meters) and they have around 300 teeth.

The largest great white shark was detected off the coast of Guadalupe Island in Mexico. It was 21 feet (6.4 meters) long with a weight of 5,000 pounds (2,268 kilograms).

The great white shark’s torpedo-shaped body allows it to cruise efficiently for a long time. Those sharks feed on small fish, as well as larger species such as seals and dolphins.

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