India’s moves to punish Pakistan after accusing it of backing the attack have driven tensions between the nuclear-armed rivals.

U.S. Secretary of State Marco Rubio called senior officials in India and Pakistan in an effort to defuse the crisis that followed last week’s deadly attack in Kashmir, the State Department said.

Pakistan said Wednesday it had “credible intelligence” that India is planning to attack it within days, and vowed to respond “very strongly,” as soldiers exchanged gunfire