Police have already arrested Bikramjit Singh, an operative of militant organisation Khalistan Liberation Force who was allegedly driving the motorcycle on that day.
Harmanpreet Kaur joined the Punjab police as a Deputy Superintendent of Police (DSP), in Chandigarh, on Thursday.
Pakistan's Inter-Services Intelligence is quite active in fomenting trouble in Punjab and the grenade attack in Amritsar was a pure act of terrorism, Singh said.
Here's a recap of events that occurred in India in the past 24 hours.
The search operation was carried out on Friday evening after a farmer claimed to have seen six suspicious persons who were carrying backpacks
A group of armed men in police uniform on Sunday attacked the Nabha Jail in Patiala and fled with five prisoners, including Khalistan Liberation Front chief Harminder Mintoo.
The other deceased were Sandeep Singh, a resident of village Rajasansi, and Kuldeep Singh.
Punjab CM Amarinder Singh said that the 'possibility of involvement of ISI-backed Khalistani/Kashmiri terror groups can't be ruled out'.
The police said that they needed the custody of the dreaded terrorist to know about the role of "insiders and outsiders" who assisted him and five others in fleeing from Nabha jail in Patiala.
Was the recent Nabha jailbreak a comment on lax security in Punjab jails? Or a sign that the separatist movement of the 1980s is dormant but alive?
Kejriwal blames Sukhbir Badal for blast, while Sukhbir, Amarinder blame the AAP chief for it.
State govt said it is not averse to seeking Army's help to maintain law and order.