Pakistan said on Tuesday its Punjab region, including the second largest city of Lahore, faced a "very high to exceptionally high" danger of flooding due to a combination of heavy rains and India's decision to release waters from two dams.

Officials say rescuers in eastern Pakistan have evacuated tens of thousands of people to safer areas after neighboring India released water from overflowing dams and swollen rivers into low-lying border regions.

The vital water-sharing treaty between Pakistan and India has had its day in court — the Hague-based Court of Arbitration said India should "let flow" the rivers for Pakistan's use. New Delhi remains unimpressed.