Papua New Guinea's cabinet has declared a state of emergency after flooding caused by Cyclone Guba killed at least 70 people.

Officials in the eastern province of Oro appealed for foreign assistance and expressed concern over flood related disease Monday.

Authorities in the Pacific nation say more people are missing and feared dead after seven consecutive days of heavy rain destroyed hundreds of houses.

Thousands of villagers in low-lying areas were forced from their homes by flood waters up to 3.5 meters high - washing away roads, bridges and crops and hampering rescue and aid efforts.

The Papua New Guinea government is assessing the damage and has promised about $18 million for relief efforts.

Some information for this report was provided by AP and Reuters.