Colombian President Juan Manuel Santos declared a state of calamity in 28 of the nation's 32 states Thursday due to heavy rains and flooding that have affected 1.2 million people.

Flooding and mudslides have killed 136 people, injured 205 and left 20 missing, the nation's Interior and Justice Ministry reported.

Emergency officials say the heavy rain has led to problems in 561 municipalities in the South American nation.

Santos made the announcement on national TV, saying the declaration will help get aid to those who need it.

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