Up to six people were injured Wednesday by an explosive hurled at a police truck near the town of Tulua in the western Colombian Valle del Cauca.
The strong explosion occurred in the early evening and according to reports was heard in many places around the town.
Some media reported that the casualties numbered four members of the police and a farmer, while others report the injured victims were two members of the police force and four civilians. A dog was also reportedly killed by the explosion.
The town authorities have attributed the attack to a column of the FARC operating in the mountainous area of Tulua.
The Valle de Cauca region of the country has long been a hotbed of FARC and illegal armed criminal activity due to its importance as a drug production area. The FARC were deemed responsible for multiple attacks on power supplies during the summer which left thousands of people without electricity for days at a time.