The title of this article suggest that a link has been found connecting all these incidents. As it turns out these are mere speculations at this point by this particular author. Rediff really needs to adhere to good journalistic principles and not fall into this ratings driven media frenzy like the US.
I think it is fair to force Pakistan to clamp down on Islamic extremists operating in India; however that demand is only valid if the Indian government itself takes the responsibility to clamp down on Hindu and other fanatic groups within its own borders. A logical assessment of this situation indicates that the perpetrators were Hindu fanatics. Like it or not Hindu fanatics (albeit less in numbers and sophistication than their islamist counterparts) have been around for some time now. Refusing to accept this reality is foolish at best and not doing anything to curb these groups and their destructive ideology is detrimental to Hinduism itself.