Ponds on the north side of Catoctin Mountain, near Gambrill Park Road and Tower Road in Frederick, Maryland, are under investigation by the FBI, in connection with the 2001 anthrax attacks. FBI investigators found anthrax spores and other evidence in their search of ponds in the area during December and January 2002. Divers retrieved a clear box with holes that could accommodate protective biological safety gloves, as well as vials wrapped in plastic from a pond in the Frederick Municipal Forest. A new theory has been developed suggesting how a criminal could have packed anthrax spores into envelopes without harming (him/her) self. Officials from Fort Detrick have stated that the water is safe because once in water anthrax spores cluster together and descend to the bottom. The water in the pond has been tested several times over the course of the investigation, and all indications are that the water is safe.