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The treaty allocated the three eastern rivers – the Ravi, Beas and Sutlej – of the Indus basin to India, while 80% of the three western ones – the Indus, Jhelum and Chenab – to Pakistan.

Indian experts say inadequate infrastructure has kept India from fully utilising even its 20% share of the Jhelum, Chenab and Indus waters under the treaty - a key reason they argue for building storage structures, which Pakistan opposes citing treaty provisions.

He tells us he drove them back and forth between his house in Sialkot and the city of Jhelum, two hours away, where Sara’s grandfather lived.

Muhammad Sharif, Sara's grandfather, said he had been hiding the children in his home in the north-eastern city of Jhelum, but would not say how long they had been there.

A police spokesman in Jhelum said 10 close relatives had been taken into custody.