NAIROBI, Kenya — Ethiopia's deadly conflict with its northern Tigray region spilled over the border Tuesday as several thousand people fled into Sudan, along with soldiers seeking protection, while the Tigray regional leader accused Eritrea of attacking at the request of Ethiopia's federal government.
Ethiopia's Nobel Peace Prize-winning Prime Minister Abiy Ahmed rejected international pleas for dialogue with the Tigray regional leaders, saying there would be no negotiations until the "law enforcement operation" is over. He seeks to arrest the heads of a regional government his administration regards as illegal while destroying its well-stocked arsenal.
Even as Britain and the African Union urged an immediate de-escalation, Abiy vowed the military would bring a speedy end to the fighting. But experts warned the conflict could drag on and destabilize one of Africa's most powerful nations.
The flow of refugees is the first visible sign of a growing humanitarian crisis affecting millions of people at the heart of the Horn of Africa. Tigray remains almost completely cut off from the world nearly a week after communications were severed and Abiy announced a military offensive in response to an alleged attack on a military base.
The United Nations and partners in Sudan are preparing for 20,000 refugees, at least initially.
Hundreds of people have been reported killed on both sides of the conflict so far, one diplomat in the capital, Addis Ababa, said. It remained difficult to confirm either side's claims. Each blames the other for sparking the conflict.
The British foreign secretary, Dominic Raab, joined the pressure on Abiy, saying he spoke with the prime minister and urged a de-escalation of the conflict: "Civilians and humanitarian access must be protected." The AU Commission chair, Moussa Faki Mahamat, called for an immediate cease-fire and stood ready to support an "inter-Ethiopian effort in the pursuit of peace."
At least 3,500 refugees, including women and children, had arrived in Sudan's Kassala province, the head of the refugee agency there, Al-Sir Khalid, told The Associated Press. Others were on the way, he said.