Eritrea denies allegations of aid obstruction but Abiy government's documents suggest soldiers have been plundering food supplies, stoking fears of starvation deaths, and blocking access to Ethiopian checkpoints.
Prime Minister Abiy Ahmed rejects claims his country was on a path to all-out war, promising to end the offensive in the northern Tigray region, where security sources say hundreds have died in recent clashes.
An escalating war of words is taking place between Eritrea and Ethiopia, as the two countries face-off over a flaring border dispute that historically claimed the lives of over 100,000 people.
Abiy has received the Nobel Peace Prize for his efforts to achieve peace and international cooperation, and in particular for his decisive initiative to resolve the border conflict with neighbouring Eritrea.
After decades of war and thousands of death, two neighbouring countries signed a peace deal last year to end the war. But the peace deal has not been fully implemented.
Border conflicts have marred east African states for decades, but some political goodwill has finally emerged in the region, seeking to build an enduring peace.
Ethiopian Prime Minister Abiy Ahmed and Eritrean President Isaias Afwerki signed the deal in the Red Sea port city of Jeddah in the presence of Saudi King Salman and UN Secretary General Antonio Guterres.
Ethiopia and Eritrea had been at war for 20 years over the location of boundaries between the two countries.
The flight is the latest concrete sign of a thaw between the neighbouring countries which began only six weeks ago.
Eritrean President Isaias Afwerki reopened his country's embassy in neighbouring Ethiopia's capital, Addis Ababa, marking a dramatic thaw in relations after years of stalemate.
"We are one people," says Eritrean President Isaias Afwerki, who is in Addis Ababa for a three-day state visit, just a month after a peace deal that ended a 1998-2000 deadly border war between two neighbours.
The arrests were made after a school director who defied government orders died in custody, says Sheila B Keetharuth, UN's human rights official in Eritrea.
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