The Quad grouping of the United States, India, Japan and Australia called on Tuesday for the perpetrators of an Islamist militant attack that killed 26 in India-administered Kashmir to be brought to justice without delay. The April 22 attack sparked heavy fighting between nuclear-armed India and Pakistan in the latest escalation of a decades-old rivalry as India blamed it on Pakistan, which denied responsibility while calling for a neutral investigation. The US State Department issued a joint statement by the foreign ministers of the grouping, who met in Washington, but stopped short of naming Pakistan or blaming Islamabad. On Monday, India's foreign minister, Subrahmanyam Jaishankar, restated its position that trade was not a factor in the ceasefire. "Relationships will never be free of issues," he said, referring to the United States, adding, "What matters is the ability to deal with it and to keep that trend going in the positive direction."