Right now no-one knows for sure who is behind the attacks, but I wouldn't be surprised if Israel has already sent some of their military to India to protect their own.
The attack was to terrorize people, no one in particular was being targeted.It is sad that people who were putting up in those areas unluckily became the target of the wrath of the terrorists.
i think that there are no specific areas where terrorists will attack. we can never tell what place because they just attack what they want to attack. not only Jewish place but also other countries.