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PESHAWAR, Pakistan — Pakistan says India launched an airstrike on its territory early Tuesday that caused no casualties, while India said it targeted a terrorist training camp in a pre-emptive strike that killed a "very large number" of militants.

The overnight raid was the latest escalation between the nuclear-armed rivals since a deadly militant attack in the disputed Kashmir region earlier this month killed more than 40 Indian soldiers. Pakistan has denied involvement in the attack but has vowed to respond to any Indian military operation against it.

The Pakistan-based militant group Jaish-e-Mohammad claimed responsibility. The bomber, who made a video before the attack, was a resident of Indian Kashmir.

Kashmir is split between the two countries but claimed by each in its entirety.

India's foreign secretary, Vijay Gokhale, told reporters in New Delhi that Indian fighter aircraft targeted Jaish-e-Mohammad camps in a pre-emptive strike after intelligence indicated another attack was being planned.