The president of Colombia called Saturday for accelerated peace negotiations with FARC guerrillas, as local media reported that seven rebels had died in an ongoing government offensive.

President Juan Manuel Santos made the announcement amid a push by the Colombian army that began Thursday with a government air strike killing 26 guerrillas in southwestern Cauca department.

Saturday's deaths brought the offensive's total fatalities to 33.

Local media reported that clashes between the Revolutionary Armed Forces of Colombia (FARC) and army in the northwestern town of Segovia also wounded one more fighter.

"We have to make decisions to stop this war as soon as possible and I'm ready to accelerate negotiations to reach a final and definitive bilateral ceasefire as quickly as possible," Santos said.

Government talks underway with the FARC in Havana have carried on for a full year "without any substantial advance," he added.

"People want to see that we can move forward so that they can have faith that we can achieve peace."

The peace talks between the government and FARC, which began in 2012, have been continually derailed by attacks from both sides.

In December, the FARC announced a ceasefire, raising hopes that the negotiations were approaching a breakthrough, but tensions have only spiraled since.

On Friday, the FARC suspended the ceasefire in response to the deadly air strike, while calling for continued dialogue with the government and for both sides to lay down their arms.

The Colombian conflict has killed some 220,000 people and uprooted five million since the Marxist-inspired FARC was founded in 1964.