Snippets from Fox article
FBI WARNS OF FLOATING BOMB DEVICES
Thursday, June 24, 2004
NEW YORK The FBI (search) warned law enforcement agencies of the potential for floating explosive devices otherwise known as terrorist improvised mines according to the weekly bulletin issued by the agency and obtained by FOX News.
"Although large-scale, military-style mining operations against the U.S. are assessed to be beyond the capabilities oftransnational terrorists, the technological sophistication demonstrated in evolving improvised explosive device (IED) construction raises the possibility of limited, geographically dispersed waterborned IED attacks," the FBI said.
The FBI also included a list of potential indicators relating to planning a floating bomb or terrorist mine attacks:
Reports of launching or retrieving boats from unusually remote areas
Reports involve aircraft dropping objects at night near harbors, ports or commercial airways
Reports of abandoned small boats found adrift near sensitive sights
Reports or incidents of unusual or unidentified floating objects near vessels or in harbors, ports or commercial waterways
Evidence suggesting trends or patterns in terrorist-related hoaxes or threat reporting dealing with mines or floating IEDds
Reports of suspicious requests for hydrographic charts associated with naval or commercial port facilities
Reports of attempts to purchase or steal large magnets, large styrofoam blocks, large diameter PVC pipe, empty compressed gas cylinders or watertight storage drums.
http://www.foxnews.com/story/0,2933,123701,00.html