The day after a deadly attack on tourists killed 26 people in the mountain town of Pahalgam in Indian-administered Kashmir, India announced it was closing a border with Pakistan, downgrading its diplomatic ties and suspending a crucial water treaty. The Indus Waters Treaty lays out how India and Pakistan use water from six rivers that flow through both countries. It was negotiated by the World Bank in 1960 and affects hundreds of millions of people on either side of the border. India's foreign secretary, Vikram Misri, told reporters on Tuesday night that the treaty will remain suspended until Pakistan "credibly...