An international relief agency says Pakistan has not fully recovered from last year's severe floods, and that the country is not adequately prepared for its upcoming monsoon season.

Oxfam says that over 800,000 families are still without proper housing in Pakistan, and that many flood defenses, such as river embankments, have still not been reconstructed.

The agency says the Pakistani government, with increased international aid, should invest in flood-resistant housing and improved early warning systems in order to prevent future disasters.

More than 1,700 people were killed and nearly 20 million others affected last year when floodwaters triggered by monsoon rains submerged one-fifth of the country.

Officials say 2 million to 5 million people are likely to be affected by this year's rains. The agency says many villagers are already starting to dismantle their houses and move to higher ground in preparation for the rainy season.