The pictures of the unidentified persons were picked up by CCTV cameras installed near the cantonment early this morning, police said.
Though the picture of the trio was not clear, the footage showed one of them carrying a bagpack, police said.
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Ludhiana Police Commissioner Parmraj Singh Umranangal said police were informed about the sighting of the suspects.
"Then we informed this incident to the Army and a search operation was launched to trace the suspects," he informed.
The suspects were seen twice moving around suspiciously on the adjoining street of the cantonment, police said.
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