Swimmers at Florida's Palm Beach have been kept out of the water for several days this week as thousands of sharks have been spotted in shallow waters close to the shoreline.

The huge shoal of sharks which has shut down beaches in Florida, is migrating up the east coast of the US to North Carolina.

Tens of thousands of the predators, mostly blacktip and spinner sharks, are moving north for their annual migration.

Researchers at Florida Atlantic University said they had counted about 15,000 sharks.

Experts said the sharks usually migrate earlier in the year during the winter. This year the migration is about a month later than expected.


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