I came across this in my surfing of the web and found this to be a good resource. You may want to take a look @ the paper in greater detail:

Future unknown: The terrorist threat to Australian maritime security

Summary of threats

Taking account of vulnerabilities and the relative impact of a successful attack, credible terrorist threats to Australia's maritime security are:

• an attack on an Australian port, either by using a ship as a weapon or by causing an explosion on board a ship carrying hazardous or dangerous cargo
• the sinking of a vessel in a channel or at a berth
• an attack on the loading and storage facilities for hazardous or volatile materials
• an attack on ships transiting the Indonesian or Philippine archipelagos carrying trade to or from Australia
• an attack on an LNG carrier loading cargo at a northwestern Australian port
• a small-boat suicide attack against a high-value target such as a warship, cruise liner, ferry, chemical tanker or oil tanker alongside in an Australian port or moving within the port
• an attack against a cruise liner or passenger ferry, including a harbour ferry
  an attack on a warship, especially a US Navy vessel, alongside in an Australian port, or an RAN vessel in an overseas port
• mining or the threat of mining to close an entrance channel to an Australian port
• smuggling of weapons or equipment, perhaps including WMD, into an Australian port
• infiltration of terrorists and/or their materials into Australia by sea, either by clandestine landing or the use of fraudulent seafarer documentation.

Blog Tags: Antiterrorism, Counterterrorism, Force Protection, Homeland Security, Maritime Security, Port Security