BOGOTA, Colombia?Gunmen killed Archbishop Isaias Duarte Cancino of the city of Cali on Saturday, silencing a voice that had often been critical of leftist Colombian rebels.

The archbishop had just completed a group wedding when he was shot outside the church in Cali, witnesses said. No one immediately claimed responsibility for the attack.

Duarte frequently had criticized leftist rebels for their attacks and kidnappings. Colombia’s 38-year-old civil war has intensified since peace talks with the main rebel army, the Revolutionary Armed Forces of Colombia, or FARC, collapsed on Feb. 20.

A smaller rebel group, the National Liberation Army, known as the ELN, had also earned Duarte’s ire for conducting mass kidnappings, including abducting worshippers at a Cali church. Although talks with the FARC collapsed, the ELN is participating in peace talks with the Colombian government in Havana, Cuba.