 A beach on Long Island is back open for swimming following a shark sighting. Scott Pringle has more. Swimmers were directed out of the water and the red flags went up after officials say lifeguards spotted a shark off Lido Beach in Hempstead. The shark was about 7 feet long and swimming about 25 feet offshore. Officials were able to track the shark's location and the beach did reopen late Monday afternoon. This comes a week after a shark was spotted in the rockways.