Police have recovered 69 rounds of 'vintage' ammunition from a small pond at Manali near Chennai.
Police said the ammunition were "certainly not service bullets" and experts were verifying the cache to ascertain its "origin" (make), which were found wrapped in a piece of cloth.
"They are pretty old ammunition.. (which are) vintage stuff.. They dont appear to be the ones used by the police and we have asked defence experts to verify them," they said, adding these could have been part of a metal scrap.
The person, possibly a metal scrap dealer, "could have thrown them into the pond fearing police action," they added.
They had given instructions to scrap dealers to inform them of any such items in their consignment, recalling the last year's cache of cannon balls, used bullets and shells from the SIPCOT industrial estate at Gummidipoondi near here.
Used shells from war-torn areas like Vietnam, Cambodia and Iraq generally comprised the imports by scrap dealers in the state, police added.