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The OLA says it is fighting for the self-determination of Ethiopia's largest ethnic group, the Oromo.

Men aged between 28 and 32 are identified by the ostrich feathers they wear, which are known in the Afaan Oromo language as "baalli".

The Oromo ethnic group is the largest in Ethiopia but some of its leaders say they have suffered discrimination from the country's traditional elites.

The OLF used to be an armed group but laid down its weapons in 2018 after Abiy Ahmed, an ethnic Oromo, became prime minister.

The OLF condemned the "brutal murder" of Mr Bate and said he was a "eloquent, brave and selfless Oromo soul".