Lifeguards (70 miles north of Miami) in Delray, Deerfield, Boca Raton and Palm Beach had to close the beaches on Tuesday after hundreds of sharks gatherd offshore.

Experts believe the sharks off Deerfield beach were black tip and spinner sharks. Experts said the sharks came so close to shore because they were chasing baitfish. The spinner species is not known as man-eaters but they have been blamed for biting people.

Now, I don't mean to alarm you. I have never seen a shark in Miami Beach, but I did have a nasty run with a Portuguese man-of-war jellyfish.

See shark photos at NBC6.