While Purushotam Singh alias Bunty, Daljit Singh and Talvinder Singh were arrested by Mohali police on Friday night, two others, including Harinder Singh who is wanted in the 2007 blast at a theatre in Ludhiana, managed to escape.
A reward of Rs 5 lakh has been announced by the police on information leading to the arrest of Harinder who had returned to India last month after fleeing to Pakistan after the Ludhiana blast.
Sources said Harinder had shifted his base to Greece from where he had come to India to carry out the blast in the national capital and Naina Devi in Himachal Pradesh.
Police also announced a reward of Rs 5 lakh on Nirmal Singh who too had managed to escape.
Police seized a pistol, some ammunition and cash totalling to about Rs one lakh from the three arrested.
While Talvinder is a resident of Delhi Purushotama and Daljit are from Punjab.
A case under Unlawful Activities Prevention Act besides Bomb and Explosives Act has been registered against the three at Zirakpur police station.
Sources said the Babbar Khalsa international module were receiving instructions from top BKI terrorists Paramjit Singh and Purushotam Goldy based abroad. They were also being helped by Pakistan-based Wadhwa Singh and Parminder Singh, sources said.