Seems premeditated to me. They trying to tell us, they went to "difuse" a qabil fight.
" Kenyan troops had descended on the area to reportedly help diffuse clan-related conflict. However, according to eye-witness testimony, about 5,000 Somali men were then taken to an airstrip and prevented from accessing water and food for five days before being executed by Kenyan soldiers.
[1]"
https://en.wikipedia.org/wiki/Wagalla_massacre
This is not their first massacre against somali. Garrisa massacre 1980
" The incident occurred when Kenyan government forces, acting on the premise of flushing out a local gangster known as Abdi Madobe, set fire to a residential village called Bulla Kartasi, killing people and raping women. They then forcefully interned the populace at Garissa Primary School football pitch for three days without water or food, resulting in over 3000 deaths."
Somali government at the time got involved
"Residents apart from Somalis were given permission to leave the school pitch unharmed. The government of Somalia, then led by the Supreme Revolutionary Council, intervened by threatening that if such brutalities did not cease, the Somali military would overthrow the Nairobi regime and occupy the country. Consequently, the Kenyan government lifted the curfew and released the detained individuals unconditionally."
https://en.wikipedia.org/wiki/Garissa_massacre