BOGOTA—Violence associated with campaigning for Colombia’s 2022 presidential and legislative elections occurred every four days over the past five months, an observation group reported on Wednesday, warning that threats and killings may increase as voting draws closer. Between March 13 and Aug. 23 there were 29 violent incidents, which claimed six lives, the Peace and Reconciliation Foundation said in a report. Most victims were elected public officials like mayors and city councillors from left-leaning parties like the Green Alliance and Human Colombia, the group said. “This situation will likely worsen nationally given the strengthening of alternative political parties compared to traditional political classes,” the report said. “As time passes and the registration of candidates moves ahead, we will see an increasing trend in acts of violence,” Esteban Salazar, one of the authors of the report, said at a virtual press conference. Legislative elections will take place in March 2022, while …