A young person was killed Saturday in a shark attack near a campground on the Gulf of Mexico, authorities said. «We have had a confirmed shark attack. The scene is still under investigation,» said Darlene Drury, spokeswoman for South Walton Fire-Rescue. Area beaches were closed to swimmers immediately afterward, AP reported. Details of the attack near Camping on the Gulf Holiday Travel Park in Walton County and the victim's name were not immediately released. Coast Guard spokesman Shawn McGivern in Mobile, Alabama, said authorities were trying to track down the victim's relatives. Patrick O'Neill, the campground's general manager, refused to comment. Florida had the largest number of documented shark attacks worldwide last year with 31.