Western intelligence agencies and maritime security experts have gone further. Some have linked al Qaeda, or militant groups associated with it, to piracy in Indonesia's waters.
Jemaah Islamiyah, a group whose goal is to create an Islamic state enveloping Malaysia, Singapore, Indonesia and the southern Philippines, has also been identified by experts as capable of hijacking a supertanker and exploding it in the strait."
A while ago I saw Mansoor Ijaz on FoxNews, and he was saying that this kind of threat is very real and could be devastating to the world economy.