on edge sharks attacking swimmers at an alarming rate. i wouldn t go out there, not now. reporter: some even calling for beach closures. but north carolina s governor instead warning beach-goers. use your common sense and listen to what the lifeguards and other local authorities are saying. reporter: a few beaches dispatching park rangers to warn swimmers to stay close to shore. all this after two attacks i felt just a tinge of pain in my leg, and i, like, looked back and saw the shark swimming away. reporter: nine attacks in three weeks along the carolina coast, seven in north carolina alone. but why so many here? shark experts say this year could be a perfect storm. a coastal drought means saltier water. factor in 80-degree water, a mix sharks love. add in a surge in fish and sea turtles we have lots of people in the water. we ve got lots of sharks.