The victims are young Eider Gutierrez and brothers Eliceo and Edgar Campo. The fourth person remains unidentified.
"Bandits attacked the youths with firearms in La Meseta, Comuneros community," Jamundi's mayor Andres Ramirez tweeted.
"Cauca Valley is in the news again because of the violence. The challenge is to bring more opportunities to the field so that these chapters of violence are not recurrent in our municipality. To the families, our accompaniment and solidarity," the mayor added.