ADDIS ABABA — Ethiopian security forces in the Oromia region have executed 39 opposition supporters and arrested at least 10,000 others accused of being members of an armed group since early 2019, Amnesty International said on Friday.

The rights group said in a report that victims were accused of supporting the Oromo Liberation Army, the breakaway armed wing of the Oromo Liberation Front, which the government had declared a terrorist movement before it was unbanned by Prime Minister Abiy Ahmed.

“Security forces have continued to violate human rights despite reforms introduced by Prime Minister Abiy Ahmed, and this is due to widespread impunity and lack of accountability for those violations,” Amnesty International’s Ethiopia researcher Fisseha Tekle said.

In a statement, the government said it “strongly rejects malicious claims of extra judicial killings, evictions and destruction of property” but would launch an independent investigation if there was evidence of any wrongdoing.

The Ethiopian army and regional police did not immediately respond to requests for comment.

Daniel Bekele, head of Ethiopia’s human rights commission, told Reuters Amnesty’s findings “should be taken very seriously”.

Abiy has brought in reforms that included removing a ban on political parties, releasing political prisoners and welcoming home exiled militant groups such as the Oromo Liberation Front.

But the new freedoms have also uncorked long-repressed tensions between Ethiopia’s many ethnic groups.

Since December 2018, the Ethiopian army has been deployed in Western and Southern Oromia to combat an insurgency by the Oromo Liberation Army.

“The report is further proof that the new administration has not parted ways with the practice of forcefully stifling dissent, committing egregious human rights violations and carrying out extrajudicial killings,” the Oromo Liberation Front and the Oromo Federalist Congress, an opposition party, said in a joint statement.

Based on interviews with 80 victims or direct witnesses of violence, Amnesty’s report said the Ethiopian army and regional security forces in Amhara and Oromia were involved in inter-ethnic killings, mass arbitrary detentions and rape.

(Reporting by Dawit Endeshaw and Giulia Paravicini; Editing by George Obulutsa and Giles Elgood)