DIG Ludhiana Range S K Kalia said here police were making all attempts to trace the killers and were working on different theories including terrorism.
However, he ruled out the possibility of personal enmity behind the killing of the father-son duo.
Senior police officers including Kalia, and SSP (Khanna) Satinder Singh and many others visited the spot and took stock of the situation.
Kalia said it was quite dark when the killings took place.
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Two unidentified bike-borne gunmen yesterday killed Satpal (65) and his son Ramesh Kumar (35) when they were working at Dera's canteen around 7 pm at Jagera village, about 55 kms from Ludhiana, police said.
Four cartridges of .32 bore weapon were recovered from the scene, police said adding that duo were shot in their heads.
Meanwhile the dead bodies of the deceased were brought to Ahmadgarh in Sangrur after the post-mortem as the victims resided at Ahmadgarh town.
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