Why are there so many bomb threats in Indian planes suddenly?

It has been around 2 months since we have seen a spike in bomb threats in Indian airlines. There were a total of 9 bomb threats today alone! These bomb threats are not only causing distress but also costing a lot of money. For every bomb threat there is a set of procedures that need to be followed. There are fighter jets that escort the plane if it is airborne and that cost is being borne by the Indian government. There are ambulances, firefighters and a lot more preparedness that takes place on ground. Not to forget the cost that the airlines have to bear with respect to fuel wastage!