Following the arrest of six people, Punjab police have named Canada-based gangster Lakhbir Singh alias Landa as the key conspirator of the rocket-propelled grenade (RPG) attack on the building housing the Punjab police intelligence headquarters on May 9. Lakhbir arranged an RPG, AK-47 and local network of criminals for logistic support to carry out the terror attack, Punjab DGP said. The key attackers are still at large.Following the arrest of six people, Punjab police have named Canada-based gangster Lakhbir Singh alias Landa as the key conspirator of the rocket-propelled grenade (RPG) attack on the building housing the Punjab police intelligence headquarters on May 9. Lakhbir arranged an RPG, AK-47 and local network of criminals for logistic support to carry out the terror attack, Punjab DGP said. The key attackers are still at large.