No investigation is required to know who is behind this bomb blast, there is no doubt that pakistan is involved in this. These pakistanis are jealous of not only the hindus but even the muslims of India, Indian muslims are supposedly among the most peacful muslims in the world (although must admit that SIMI is now getting involved in some incidents of late) The bomb blasts occur in places where there are significant population of hindus & muslims living togather, this is nothing but an pakistani attempt to destroy india by dividing its people, also note that even on this forum there are many pakis disguised as indian muslims posting anti-hindu messages.