While the Punjab CM expressed grief, his Congress colleagues targeted Sushma Swaraj for misleading the families.
Former PM Atal Bihari Vajpayee was on Friday conferred with the Bharat Ratna.
Punjab Education Minister Surjit Singh Rakhra on Saturday triggered a controversy by making an insensitive comment that the death of the teenage girl, who was molested and thrown off a bus belonging to the ruling Badal family, was God's will.
Joint Commissioner of Police Rakesh Maria said that the bombs were kept in a backpack and made of low-intensity explosives like gunpowder. The arrested duo has been identified as Rajeev Jaigovind Singh and Soumitra Badal Roy.