The UK intelligence agency MI5 issued a Caution advising industry of the possibility that terrorists might attempt to deliver bombs by means of aircraft or ships. In particular, it notes that it would be possible to ship-bomb a port or coastal city by building a very large – or nuclear – device into a merchant ship. MI5 acknowledges that this is a threat that only governments and the industry concerned can effectively do anything about (although it is unclear what the maritime industry is supposed to do to prevent such an event). (HK Law)