Amhara forces killed dozens of civilians and burned properties in Jille Dhummuga district of the Oromo Zone.
He urged Ethiopia to take similar measures on citizens who disrespect the country and its leaders.
The officer, an ethnic Amhara, was found guilty of intentional homicide by Jigjiga high court.
Several videos and pictures showcasing atrocities Fano committed have surfaced on social media.
Bayisa Wak-Woya, a veteran UN diplomat, says no peace in Oromia means no peace in Ethiopia.
The OLF calls on the United Nations Human Rights Council to launch an investigation in Oromia.
"Armed men" opened fire at the congregation of Mula'tu Gela church in Sorga, Nekemte city, killing fifteen individuals.
OLF expressed its sadness at the loss of its member.
"Fano entered the town and went on a shooting spree."
"OFC strongly condemns any killing of civilians.”