I agree with Amos. As to conspiracy there is the testimony of at least two people on the bus who claim they saw the suicide bomber explode before their eyes.
All I would ask is that those who wish to distance themselves from religion and its fanaticisms look seriously at the non-faith of Humanism which seems to put into practice all that is best in the foundations of religions while not believing in the Supernatural nonsenses that lead to faith being the instrument of death and misery.