ADDIS ABABA, Ethiopia — The head of Ethiopia’s army suggested neighboring Eritrea, Sudan and Egypt were supporting rebel troops who have captured several strategic towns in renewed fighting in the north, drawing denials as the threat of a widening regional conflict grew on Monday.

Field Marshal Birhanu Jula, chief of general staff of the Ethiopian National Defense Force, on Friday accused Eritrea of mobilizing financial support for the Tigray People’s Liberation Front, or TPLF.

The TPLF and Ethiopian federal troops waged war between November 2020 and November 2022, when a peace deal was signed in Pretoria, South Africa. A caretaker administration seen as loyal to Ethiopian Prime Minister Abiy Ahmed was installed in Mekelle, the Tigray capital. But tensions remained, with the TPLF maneuvering for political control in Mekelle.

TPLF fighters over the weekend captured the key strategic town of Erebti in the northern Afar region, a commander told The Associated Press on Monday. He spoke on condition of anonymity because he wasn’t authorize to speak to media.

An official with the Tigray Peace Force, a breakaway faction of Tigray rebels now allied with federal forces in Afar, confirmed that the rebels took control of the town, although he denied that heavy fighting had taken place.

Doctors Without Borders, better known by its French acronym MSF, on Monday said there had been a surge in the number of wounded receiving treatment in the north.

The number of patients in the Korem and Alamata hospitals rose from around 180 to more than 420 in 48 hours. MSF said 300 wounded had arrived at northeastern Suhul Hospital last week.

Ethiopian federal authorities accused the TPLF of seeking to build an alliance with neighboring Eritrea to destabilize Ethiopia. Abiy’s push for sovereign access to the Eritrean seaport of Assab has reignited tensions with Eritrea, which shares a border with Tigray. Abiy also angered Somalia by trying to negotiate access to the sea via the territory of Somaliland.

Eritrea accused Ethiopia of shifting blame for the ongoing conflict. Eritrea’s Information Minister Yemane Meskel wrote on X that Ethiopia’s pursuit of access to the sea had rattled Eritrea and Somalia, while its move to host militia training in support of Sudan’s military had put Ethiopia at odds with its neighbors.

A spokesperson for the Sudanese armed forces in a statement rejected Ethiopia’s accusations, adding that Ethiopia was offering support to militias fighting the Sudanese military, an apparent reference to the Rapid Support Forces, which have been battling Sudan’s army since 2023.

Eritrean troops fought alongside Ethiopian forces against the TPLF in the 2020-2022 Tigray conflict. The civilian death toll was estimated by Ghent University researchers at 500,000, including from violence, famine and the collapse of health services.