The incident came to light when devotees reached the temple this morning to offer prayers and found priest Ballu Ram (20), Dhalla Ram (58) and Kapura Ram (40) dead, they said.
After a preliminary investigation, the police said the accused had come to loot the temple last night.
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When the trio resisted, they were attacked with sharp- edged weapons, they said.
No arrests have been made so far and the matter is under investigation, the police said, adding the bodies have been sent for postmortem.