No way there were that many Bangladesi's and no Indian Muslims involved, for all I know there aren't any Bangladeshi's who can think of these acts without some Indian Muslim bringing it to them. The extremist outfits in my country aren't active in my country and probably recruitement service for indian muslim extremist groups.
Most Bangladeshi muslims hardly pick themselves up to go to the Friday prayer and there too there are no sermons as aggresive as some of the ones I have to hear, here in London, it's almost embarassing to say prayer with this people here.
Minus something is not realistic, anyways I wanted to add that the probability of Bangladesh's government's involvement is zero, because Bangladesh has no government at this moment.