On April 1, a grenade was thrown at the BJP headquarters in Sector 37, Chandigarh, resulting in no casualties. The Punjab Police, in collaboration with Chandigarh Police, have arrested five individuals linked to the attack, which is believed to be orchestrated by a terror module supported by Pakistan's Inter-Services Intelligence (ISI). The arrested suspects include Balwinder Lal alias Shami, Jasvir Singh alias Jassi, Charanjit Singh alias Channi, Rubal Chauhan, and Mandeep alias Abhijot Sharma. Two primary perpetrators, Gurtej Singh and Amanpreet Singh, remain at large. Authorities recovered one hand grenade and 15 live .30-bore cartridges during the investigation. The DGP of Punjab Police, Gaurav Yadav, stated that the module operated under the direct instructions of handlers based in Portugal and Germany. The investigation revealed a structured network that utilized multiple operatives to transport weapons and execute the attack. Police are conducting raids to apprehend the absconding suspects and trace the broader terror supply chain.