The Ethiopian government has said recent military operations against rebels in the restive states of Benishangul-Gumuz, Oromia and Amhara were "successful" and brought relative peace to the regions.
Prime Minister Abiy Ahmed's spokesperson, Billene Seyoum, told journalists on Thursday that government forces had destroyed rebel training bases and seized weapons in the operations.
Ms Billene accused the rebels of committing "heinous acts" after more than 330 civilians were killed in Oromia region on 18 June.
Following the killings, the Ethiopian military launched an operation against the Oromo Liberation Army (OLA) rebel group, which denied any role in the killings.
“The architects of ethnic strife colluding with their foreign masters know which strings to pull in the divisive fabric-weaving for the past 28 years,” Ms Billene said.
Nearly 400,000 people displaced due to recent unrest in the three regional states "have returned to their homes", according to officials.
The UN has said it will investigate the Oromia incident.