Shark in the ocean
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Thousands of sharks force beach closures in America

9 March 2013 Last updated at 11:10 GMT

Beaches in Florida have been closed as a huge school of sharks swam close to the shore during their annual migration.

Thousands of Black Tip and Spinner sharks are heading north up the Atlantic coast.

The sharks can grow up to three metres in length by the time they are an adult.

All along the route, people are being banned from the sea, just as the annual Spring Break holidays reach their peak.