South Korea's President Lee Jae Myung declared six districts as special disaster zones on Tuesday after days of torrential rains left a trail of destruction in parts of the country.

As rescuers search for the missing under the rubble, thousands of evacuated villagers face the daunting task of rebuilding their homes.

Two days of heavy downpours in South Korea have killed at least four people and forced more than 1,300 others to evacuate.