The Somalis that are being killed reside in cities and towns across Oromia. These are not people that live in the border districts. The Oromo version of Liyu Police along with the general public are the ones that are carrying out the murders. The local and federal authorities have basically told the trapped Somali civilians are on their own.
While the Liyu Police have indeed committed crimes, the killings by the Oromo are under-reported and largely target civilians. The number of displaced Somalis have also been under-reported. The Oromo has an advantage over the Somalis in that they have more influence at the federal level. The current situation was initially instigated by the TLPF but there always have been simmering tensions that were bound to explode.
The situation was also happening in other parts of Ethiopia though at slower rate, many Amharas and Tigray were killed in Oromo. Tigray businessmen have been kicked out of the Amhara Region. Institutions and regions are becoming segregated. It is not clear if this is by a design or things are just getting out of hand.
Anyway, the situation does not bode well for the region. As much as I like to see Ethiopia disintegrate, a collapse of Ethiopia would be catastrophic.