The report coming about the deaths are not accurate, but there have been report for 1 death and 9 injured.
What can be the cause for this ? Any terrorist attack ? Terrorist attacks WERE normal some years back but following some years, there haven't been any NEWS about a terrorist bomb blast but if you live in Assam then you may have heard about the Bangladeshi and Assamese fight, because grenade explosion don't seem to be done by a terrorist. It can be called a local attack.
What I can really say is that please keep peace and people's lives are more important than fights.. Nothing happens to those who arises the fights but innocent public have to suffer or even there are loss of lives.