New Delhi on Wednesday closed key land border crossings and suspended a key water-sharing treaty with Pakistan, accusing Islamabad of "cross-border terrorism" after gunmen opened fire on tourists in the disputed Kashmir region on Tuesday, killing 26 people. The attack, which was claimed by the previously unknown Kashmir Resistance group, was the deadliest since 2000, and with the killer still at large, tourists have fled en masse and businesses have been forced to remain closed.