First I want to give my sympathies to the families affected by this. Whoever did this needs to be caught and punished. If (and this is a big if) it was Sikh separatists you will see that the Sikh community will be among this first demanding the criminals be arrested. Even Sikh's who want Kalistan do not condone or even try to explain terrorists (and it is a fact that most Sihks in India do not want a seperate state- rather they want and deserve human rights and respect). If it is Islamic militants I hope for a strong rejection by the Muslim community- but it has never happened before. We will only get excuses again.