(assuming this was carried out by Islamists) i suspect this isnt Jihad, in the sense that it's not the same movement that lead to the London bombings, but more of a local thing, where Christians are seen as outsiders. So it's against Christians INSIDE the country rather than those outside.
		
		
	 
Muslims are as much 'outsiders' as Christians in Sri Lanka.  On the whole the Buddhist majority regard the Tamils, the Muslims and the Eurasians as 'outsiders'.   If this were purely local Muslims it would be odd becuase it would be one minority outsider group targeting another.
  I'm commenting way too prematurely so will probably get this entirely wrong, because I have absolutely no idea who did this at the moment.  But the Muslim minority in Sri Lanka has recently been targeted by the Buddhist majority, and what was surprising about that to me was that traditionally there was a tendency to leave the Muslims alone becuase of nervousness about possible repercussions for all the Sri Lankans working in the Muslim countries of the Gulf.
I did wonder if the sudden anti-Muslim attacks were some weird kind of 'conservation of hatred' at work, in that things had quietened down with the Tamils, so a new enemy was required?
But I haven't a clue who did this, as of this moment.
And of course both Muslims and Tamils (Hindus) have been known to go in for sucide bombing.  But, again, it would be quite odd for Tamils to attack another minority rather than just the Sri Lankan state or Buddhist majority.
If I had to make a way-too-early guess, it would be Islamists acting under some international Jihadist ideological influence, rather than any purely local thing.  But it's horrific and pointless whatever it is.