More hospital waste was spotted on Long Island's Atlantic beaches Friday, forcing health officials to close famous Jones Beach to bathers as temperatures soared toward 90 degrees.

The source of the loathsome garbage, including vials of blood and intravenous tubing, remained a mystery.

Jones Beach, 15 miles east of New York City, was closed to swimmers at 7:30 a.m. Friday. Further east, the huge stretch of beach at Robert Moses State Park on Fire Island remained closed, as well as four neighboring community beaches on the fashionable strand.

Officials said both swimming and sunbathing were banned at Robert Moses, because sunseekers have been picking up refuse and bringing it to park employees.

Officials were afraid that people might cut themselves on the sharp edges of syringes or other objects, said Michael Asheroff, deputy director of Long Island State Park Region.