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."
Tigrayan rebels fighting the central government are withdrawing from neighbouring regions in northern Ethiopia, a step towards a possible ceasefire after 13 months of a brutal war.
Ethiopia’s Tigray forces joined with other armed and opposition groups around the country in an alliance against Prime Minister Abiy Ahmed seeking a transitional process after a year of war, but also allowing for his exit by force.
"Some 18,600 children under the age of five in Tigray have been admitted for treatment for severe acute malnutrition from February to August this year compared to 8,900 in 2020, a 100% increase," says UN.
Ethiopia’s national army, alongside special forces of the northern Amhara region, launched a coordinated offensive early on Monday, says a Tigray People’s Liberation Front spokesperson.
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