Chandigarh, April 5 -- The counter-intelligence wing of the Punjab Police, in coordination with the Chandigarh Police, on Saturday claimed to have cracked the April 1 BJP headquarters explosion case with the arrest of five accused and the recovery of a hand grenade and 10 live .30 bore cartridges. A minor explosion was reported outside the Punjab BJP headquarters in Chandigarh on April 1, with police saying a "crude" device appeared to have been hurled. No casualties were reported. The party headquarters is located in Sector 37, which also houses Law Bhavan and a petrol pump. According to officers familiar with the matter, preliminary investigations revealed that the attack was executed by a Pakistan's ISI-backed module operating under the ...