According to Al Jazeera, a regional official said that the violence took place in Ethiopia before the national elections in June this year.
Ahmed Hameed, the deputy commissioner of police in the Afar region, accused the Somali region of attacking regional forces.
Clashes began on Friday and continued into Tuesday, killing more than 100 people, most of them civilians, he said.
Ali Bedel, a spokesman for the Somali region, said 25 people had been killed on Friday and that an “unknown number of civilians” had been killed on Tuesday.
According to a report by the foreign news agency Reuters, it has not been independently confirmed whether these 25 deaths are also among the 100 killed.
Ahmed Kellot of Afar Region also said that Somali special police and militia raided an area named Haruka and “indiscriminately fired on locals”.
More than 30 Afar civilians were killed and at least 50 others were injured, he said.
He said that the local community had also caught and tortured a few attackers here and now there was temporary peace in the area.
Both sides blamed each other for the attack.
Earlier in 2014, the border between the two states was re-established by the federal government and was then a coalition government led by the Ethiopian People’s Revolutionary Democratic Front (EPRDF).
At the time of the settlement of the dispute, three small towns were annexed from Somali to Afar, and efforts have been made to recapture them, with militias from the two eastern states clashing over their disputed borders.
A wave of clashes on the border in October last year killed 27 people.