One person was killed and seven others wounded Thursday when FARC guerrillas detonated a motorcycle bomb in the southwestern town of Pradera, Colombian police told Efe.
The explosives-laden motorbike went off shortly after dawn in front of the town hall and police station in Pradera, a municipality near Cali, Colombia's third-largest city.
Authorities blamed the attack on the 6th Front of the Revolutionary Armed Forces of Colombia, or FARC, the Andean nation's largest insurgency.
The explosion came a day after the expiration of the FARC's unilateral month-long holiday truce.
While a spokesman for the Valle del Cauca provincial police told Efe only one person was killed, Cali daily El Pais said that two people died and 39 others were hurt.
The attack was likely the work of one of the FARC units opposed to the guerrillas' ongoing peace talks with the Colombian government, analysts at the CERAC think-tank said.
Some of those injured in Thursday's explosion were taken to hospitals in Cali, the provincial capital.
Colombian President Juan Manuel Santos, whose administration launched the peace process with the FARC in November 2012, spent the day in Popayan, capital of the neighboring province of Cauca.
An army soldier was killed Wednesday in a clash with FARC fighters in the northwestern province of Choco. EFE