The clashes between rival guerrilla groups have left 80 dead as Colombia braces for cutbacks in U.S. foreign aid under President Trump.

Colombian president Gustavo Petro says he will declare a state of emergency, following a spate of guerrilla attacks in the country's northeast that has killed dozens of people and forced

The ELN, which has an estimated 6,000 fighters, reportedly attacked civilians it accused of collaborating with a rival group, the FARC-EMC, shooting them in the streets, while in rural areas firefights broke out between members of both groups.

Colombia on Wednesday reinstated arrest warrants for dozens of guerrilla commanders blamed for armed attacks that displaced 32,000 people and sparked the country's most serious security crisis in years.