Joy about an India-Pakistan ceasefire was short-lived in Kashmir. Tens of thousands fled the Indian-controlled part of the disputed region last week amid heavy shelling and drone attacks by Pakistan.

The truce came after several days of the countries’ most expansive fighting in decades. One Indian official said the country would “deal strongly” with any violations.

The sudden announcement of a U.S.-brokered ceasefire followed four days of steady escalation between India and Pakistan and mixed signals from Washington.