I think all Ben is saying Arista, as was I, that the bombing is very hard to make sense of according to its location and victims.
Nobody is denying that there was a bomb, or that it went off at a shrine, it's just because Ben also knows the East well, it is a very peculiar and unique kind of attack, and no group has yet claimed any responsibility...which is even more unusual.
At the moment it seems as though it was either a lone perpetrator, or a couple - the video footage shows a young man leaving a backpack on a bench which would presumably have been picked up and sited.
Commentators close to the political situation can also not make much sense of it...please see here:
http://www.bbc.co.uk/news/world-asia-33970901