What’s behind the series of Long Island shark attacks? At least one beach delayed opening to holiday revelers Tuesday, after officials said drones spotted some 50 sand sharks that morning near a popular beach park. There were approximately 50 sand sharks there," Charles Gorman, New York State Parks Regional Director, told CBS New York. The beach was closed once more after a possible shark sighting, but officials determined it was a dolphin. Soon after, miles away, a 49-year-old man reported having a hand bitten while swimming near Fire Island Pines Beach.