Amhara regional government has confirmed the fighting as all security forces are working to calm the situation.
Hundreds of officers enter Mekelle to secure vital installations, part of last month's peace deal, while three African generals assigned to lead monitoring team and envoys from almost three dozen countries also visit the war-torn region's main city.
Trucks with tonnes of medical supplies and equipment arrive in Mekelle city, following signing of peace agreement by government and rebels in Pretoria and Nairobi, says International Committee of the Red Cross.
More than 60 people were killed and over 70 wounded during ethnic violence in the western region's Amuru district from August 30 to 31, says Ethiopian Human Rights Commission.
Oromo Liberation Army denies its fighters killed over 400 Amhara civilians, the East African country's second-largest ethnic group after the Oromo.
Parliament's announcement comes as African Union calls for a probe into killings in Oromia state's western area, where OLA rebels are accused of killing hundreds of people.
"Citizens living in the Qellem Wollega zone of Oromia state have been massacred," Ethiopian PM Abiy Ahmed says, vowing to "eradicate" Oromo Liberation Army.
Khartoum captures Jabal Kala al Laban and destroys a military base in the restive area, according to Sudanese military sources and local residents.
More than 200 people, mostly from ethnic Amhara, have been killed in Ethiopia's Oromia region in an attack being blamed on a rebel group known as Oromo Liberation Army.
The arrests have triggered international concern over "the narrowing space for freedom of expression and independent media" in the African country.
The Ethiopian Human Rights Commission has catalogued a litany of abuses, including torture, gang rape and enforced disappearances, saying some may amount to war crimes.
Addis Ababa says its military will remain in recently-liberated northern Amhara and Afar regions, adding the TPLF rebels have been hit hard and are no longer capable of "executing wishes."
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2023 TRT World.