India doubled down on its decision to indefinitely suspend the Indus water treaty on Thursday evening, formally notifying Pakistan that it comes into effect immediately and explaining why -- sustained terror amid other reasons. The letter came shortly after Islamabad -- scrambling to retaliate against New Delhi's diplomatic offensive after the Pahalgam massacre -- threatened to suspend all agreements between the two countries, including the Simla pact of 1972, which validates the Line of Control in Jammu and Kashmir and Ladakh.