Chandigarh, April 6 -- The counter-intelligence wing of Punjab Police, in a joint operation with Chandigarh Police and Haryana Police, arrested the two main perpetrators, who lobbed a hand grenade outside the Bharatiya Janata Party (BJP) office in Sector 37, Chandigarh, on April 1, director general of police Gaurav Yadav said on Sunday.

With this, the total number of arrests in the case has risen to seven. Those arrested from Rewari have been identified as Gurtej Singh and Amanpreet Singh, both residents of Rattangarh in Rupnagar, police officials, privy to the probe, said.

The duo was trying to flee to Nepal. Accused Amanpreet Singh has a prior criminal record, with FIRs of theft and snatching registered against him in Mohali and Bilas...