An eyewitness described the moment when the second shark attack took place off a North Carolina beach on Sunday, describing how the shark breached the water.

"He looked like he was waving at his friends," Randy Milligan said of the unidentified 16-year-old boy who was attacked. "Then the shark just came out of the water and like you snap your fingers -- bit his whole arm off."

"I would imagine to inflict that kind of damage it must be a relatively large shark," doctor said.

"I would imagine to inflict that kind of damage it must be a relatively large shark," Hooks said.

County authorities still have no idea where the shark, or sharks, are now but have been using helicopters and boats to patrol the areas near the attacks.