Your most likely suspect?
"Sand Sharks
These sharks are by far the most common sharks you might see along the shoreline in North Carolina and generally speaking they are very docile. They look rather fierce with rows of protruding teeth and they can grow to around ten feet long. As a rule, the sand shark will not bother swimmers unless provoked into doing so."
Read more: http://www.city-data.com/forum/coastal-n...
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I was maybe 20 feet out, only waist deep in water (2.5-3ft) with my friend and boyfriend. My friend noticed a shadow circling my boyfriend then noticed a shark fin come out of the water and it was on a straight path to my boyfriend at that point. My friend yelled and my boyfriend stepped out of the way, throwing the shark off a bit so it turned a little on it's back but it basically touched my boyfriend as it turned back around him, then it started circling me so we all held on to eachother and ran out of the water. It was about 5 feet long, had a light white belly and a dark greyish tan back. I'm not sure if it's behavior indicated an attack or if it was just swimming around. The beach was really busy and I didn't think sharks went too close to masses of people, Does this sound like any sharks known to attack people in Atlantic Beach area of North Carolina?