Colombia's anti-government guerrillas have grown stronger under President Gustavo Petro's three years in office.

A car bomb and a separate attack on a police helicopter in Colombia killed at least 17 people Thursday, according to authorities. President Gustavo Petro attributed both attacks to dissidents of the defunct Revolutionary Armed Forces of Colombia,

An attack on a Colombian National Police helicopter and a suspected car bombing near a military air base left at least 14 people dead Thursday in what Colombian authorities are describing as terrorist acts.