More than 300 foreign tourists are stranded in India’s Himalayan region of Ladakh, three days after flash floods killed at least 150 people and ravaged the main town of Leh, officials said on Monday.

Floods triggered by unexpected heavy rains destroyed houses, uprooted telephone towers and deposited boulders and mud up to 15 feet high on highways and destroyed all communication networks, authorities and witnesses said.

At least 300 people are still missing and 25,000 people affected by the floods, army officials said. At least 7,000 soldiers were deployed to rebuild roads and bridges, they said.