India learnt from stalwarts to sacrifice some lives in false flag operation within own country and put it on rival country. This game is old. If all such attacks are honestly investigated by the UN, top intelligence agencies of some powerful countires will be exposed. ISIS is sure on role of these agencies, was created by them and are being funded and master minded by them.
The reason for Brussels attack is simple. The enemies who devastated Libya, Syria, Iraq and Afghanistan can not allow the Muslims to enter in larger numbers in Europe as they fear that Europe may become sympathetic to Muslims. Therefore, such attacks are being manipulated. First in Paris and now in Brussels. The sympathy for the refugees had turned into hostility by Paris drama and now with Brussels drama it will become stronger. So, the reason for this attack is not very difficult to understand.