Apart from threats from within bangladesi militants, Australia can not discount the fact that pak being a frustrated one with no country playing in pak soil, and as india feels would not like paki team to come to india, pak will instigate voilance in Bangladesh desh.Also after their accidental success over India these Bangladesh deshi minnows nastily behaved and same may happen to Australians which they can avoid by cancelling the trip.In fact India also should avoid going to Bangladesh in future.If they want play them in india