Police commissioner Jatinder Singh Aulukh said the assailants were arrested from Jalandhar-Pathankot road near village Krishan Garh.
They have been identified as Sukhwinder Singh alias Sonu (Chowk Mehta), Manveer Singh alias Mahant (village Sudhar Ludhiana), Gurpreet Singh alias Gopi (Haridwar) Satnam Singh (Kotkapura - Faridkot).
They have confessed their involvement in the attack, the CP said, adding the police had also impounded their SUV.
He said that the raiding party was jointly led by ADCP (Investigations) Balkar Singh and ADCP Parmjit Singh Pannu.
They were on way to address a religious function in a nearby village Isewal when the attack took place.
Four persons were already arrested and were on police remand.
