One thing is clear - if the people who pulled this off had any kind of political intention, that must been to scupper the peace process. That in fact makes it a lot less likely to have been an officially sanctioned IRA job. Of course there are a fair number of people on all sides who might have that sort of agenda.

And if it was just about the money, without any political intent at all, that doesn't really sound as if the IRA would have been likely to have authorised it.