Residents of Mekelle told the BBC that Tigrayan forces had taken over the regional capital's airport from federal police. No flights are currently landing, and Ethiopian Airlines has suspended services to Mekelle, Shire and Axum, citing the "current situation" in Tigray.
The seizure follows a year of mounting tensions between the federal government and the Tigray People's Liberation Front (TPLF), the ruling party in Tigray. On Sunday, the TPLF announced an alliance with six armed groups in Ethiopia aimed at removing the government in Addis Ababa.
The developments come after the 2022 African Union-mediated peace deal that ended a two-year civil war – one of the deadliest conflicts this century, with AU mediator estimates of some 600,000 deaths. Both sides now accuse each other of violating the deal.
The flight suspension follows reported drone strikes in Tigray. On Tuesday, a strike in the southern town of Alamata killed at least 14 people and injured 22 others, according to Tigrayan authorities. The town's mayor, Mogos Shiferaw, told the BBC that more than five drones and one fighter jet carried out more than 21 strikes starting at around 03:30 local time.
"This caused a lot of psychological trauma in our city and our people were in a state of panic," Mogos said, adding that all those killed and injured were civilians. He accused federal forces of carrying out the strikes.