State Public Health Engineering department officials today said that the poisoning of Serlui river, a tributary of river Tlawng, where from water is supplied to Aizawl, was detected yesterday and all the tanks were emptied.
Yesterday morning, a large number of dead fish, crab and prawn was found floating in the river. Later, laboratory tests confirmed the poisoning, officials said.
Around 47 lakh litres of water, already pumped into tanks got wasted, they said, adding that sabotage cannot be ruled out in the case.