PALM BEACH, Florida (CBSMiami) - The beaches are open Thursday in Palm BeachCounty following several days of shark scares near the shore.

For the last two days, beaches were shutdown after thousands of sharks were spotted swimming close to the shoreline.

The marine predators, mostly blacktip and spinner sharks, have beenspotted from Boca Raton to Jupiter since the start of the month.

Shark sightings off South Florida are not uncommon this time of year. Marine biologists say the sharks are migrating north.

Wednesday, sharks caused the closings at three Palm Beach County beaches.

Once a shark appears near the shore, a lifeguard will close the beachand keep it closed until half hour after the last shark is spotted.

If you're swimming at a South Florida beach, be sure to swim alongbeaches where lifeguards are present. Also, leave your jewelry on theshore. Scientists say sharks are attracted to silver, along with thecolors yellow and gold.

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