Hachalu Hundessa poses in traditional Ethiopian costume in Addis Ababa in March 2019.
Addis Ababa, Ethiopia CNN  — 

At least 81 people are dead in Ethiopia in massive protests that erupted after the killing of singer and activist Hachalu Hundessa, local police commissioner told state media.

The 34-year-old singer was shot by unknown gunmen in Addis Ababa on Monday, sparking demonstrations in the capital that have spread to several towns in the Oromia region of the country.

Three police officers and 78 civilians, including an unnamed uncle of the musician, were among those killed during the “mayhem” in the town of Ambo, Oromia region police commissioner, Bedesa Merdasa said in a press conference broadcast on state media on Wednesday.

A grab made from video shows protesters marching on July 1 in Addis Ababa.

Thirty-five people were also arrested during the protests, including prominent Oromo political activist Jawar Mohammed, federal police commissioner Endeshaw Tasew said on Tuesday night.

Jawar is a former ally of Prime Minister Abiy Ahmed, who is also an Oromo, but has become a critic of the government. He was held during a standoff between police and protesters who were tryng to stop Hachula’s corpse from leaving the capital, according to Tasew. Journalist Eskinder Nega was also arrested, Tasew said, giving few details.

The motive of Hachalu’s killing remains unclear but an investigation is underway and several suspects have been arrested, the police commissioner said.

Reaction to his death has spread as far as the United States. Ethiopians in Minnesota gathered and wove their country’s flags in demonstration on Wednesday.

The Ethiopian diaspora community in Minnesota mourns Hachalu's death on Wednesday.

Who was Hachalu Hundessa?

Hachalu, a legendary figure in the Oromo ethnic group, was part of that movement and 2015 protests that eventually led to political reforms in Ethiopia in 2018.

His songs highlighted frustrations of people in Oromia, where people have often complained of being marginalized politically; his music was the undertone for the campaign for political reforms that eventually saw the end of the previous administration.

By Thursday, protests in the capital Addis Ababa had largely subsided as military troops patrolled the deserted streets in the city.

Hachalu was laid to rest in a brief, private ceremony in his hometown of Ambo in the Oromia region on Thursday, local broadcast media reported.

Internet blackout

Internet watchdog Netblocks, which tracks connectivity in the country, said internet was shut down across Ethiopia for the third day, according to CEO Alp Toker Thursday morning.

“The general population are offline…which is quite significant and people do relay on the internet especially during the time of crisis. At this moment there is this information blackout,” Toker said.

Rights groups have accused authorities of routinely shutting down internet and telecommunications services during protests, as well as the country’s only telecoms provider owned solely by the state.

Human Rights Watch said the internet blackout has stoked tensions and increased concerns about protesters being suppressed, and urged authorities to restore connection.

The rights group said three protesters were killed by security forces, while a doctor in Dire Dawa town said he treated eight people with gunshots fired by security forces to disperse protests.

“Rather than restoring calm, the authorities’ internet shutdown, apparent excessive use of force, and arrest of political opposition figures could make a volatile situation even worse. The government should take prompt steps to reverse these actions or risk sliding deeper into crisis,” the rights group said in a statement.

CNN’s Eleni Giokos contributed to this report.