Norwegian news reports that Florida have been invaded by large schools of sharks, and that beaches are closed. The theory is that they are following small squids and sardines.

Any truth to this, or just sensational press? Is this a regulary occuring thing?

Ref: http://www.vg.no/pub/vgart.hbs?artid=103726
(It's in norwegian, but the pictures are nice, and Palm Beach is mentioned as closed. Unfortunately, Babelfish doesn't do scandinavian languages yet.)