That would be the highest single-day death toll among protesters who are demanding that the elected government of Aung San Suu Kyi be restored to power after being ousted by a Feb. 1 coup.

“Deaths reportedly occurred as a result of live ammunition fired into crowds in Yangon, Dawei, Mandalay, Myeik, Bago and Pokokku,” the U.N. Human Rights Office said in a statement referring to several cities, adding that the forces also used tear gas, flash-bang grenades and stun grenades.

“We strongly condemn the escalating violence against protests in Myanmar and call on the military to immediately halt the use of force against peaceful protesters,” its spokesperson Ravina Shamdasani was quoted saying.

An Associated Press journalist was taken into police custody on Saturday morning while providing news coverage of the protests. The journalist, Thein Zaw, remains in police custody.

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The Democratic Voice of Burma reported that as of 5 p.m. in Myanmar, there had been 19 confirmed deaths in nine cities, with another 10 deaths unconfirmed. The independent media company broadcasts on satellite and digital terrestrial television, as well as online.

Myanmar riot police crossing blockage during a protest against the military coup in Mandalay, Myanmar, Sunday, Feb. 28, 2021. Photo: AP

DVB counted five deaths in Yangon and two in Mandalay, the largest and second-largest cities.

It registered five deaths in Dawei, a much smaller city in southeastern Myanmar that has seen tens of thousands of protesters nearly every day since the coup. Witnesses said Sunday’s march was also large and people were determined not to be driven off the streets.

Confirming the deaths of protesters has been difficult amid the chaos and general lack of news from official sources, especially in areas outside Yangon, Mandalay and the capital of Naypyitaw. But in many cases, photos and video circulated showed circumstances of the killings and gruesome photos of bodies.

Gunfire earlier had been reported during protests in Yangon, as police also fired tear gas and water cannons while trying to clear the streets. Photos of shell casings from live ammunition used in assault rifles were posted on social media.

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Initial reports on social media identified one young man believed to have been killed. His body was shown in photos and videos lying on a sidewalk until other protesters carried him away.

In Dawei, local media reported at least three people were killed during a protest march, supported by photos and video. Photos on social media showed one wounded man in the care of medical personnel.

Protesters rush to try to block the road as police arrive during a protest against the military coup in Mandalay, Myanmar, Sunday, Feb. 28, 2021. Photo: AP

Before Sunday, there had been eight confirmed reports of killings linked to the army’s takeover, according to the independent Assistance Association of Political Prisoners.

The Feb. 1 coup reversed years of slow progress toward democracy after five decades of military rule. Suu Kyi’s National League for Democracy party would have been installed for a second five-year term in office, but the army blocked Parliament from convening and detained her and President Win Myint, as well as other top members of Suu Kyi’s government.

On Sunday morning, medical students marched in Yangon near the Hledan Center intersection, which has become the gathering point for protesters who then fan out to other parts of the city.

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Videos and photos showed protesters running as police charged at them, and residents setting up makeshift roadblocks to slow their advance. Some protesters managed to throw tear gas canisters back at police. Nearby, residents were pleading with police to release those they picked up from the street and shoved into police trucks to be taken away. Dozens or more were believed to be detained.

“The world is watching the actions of the Myanmar military junta, and will hold them accountable,” said Phil Robertson, deputy Asia director for New York-based Human Rights Watch. “Live ammunition should not be used to control or disperse protests and lethal force can only be used to protect life or prevent serious injury.”

Security forces began employing rougher tactics on Saturday, taking preemptive actions to break up protests and making scores, if not hundreds, of arrests. Greater numbers of soldiers also joined police. Many of those detained were taken to Insein Prison in Yangon’s northern outskirts, historically notorious for holding political prisoners.

According to the Assistance Association of Political Prisoners, as of Saturday, 854 people had been arrested, charged or sentenced at one point in relation to the coup, and 771 were being detained or sought for arrest. The group said that while it had documented 75 new arrests, it understood that hundreds of other people were also picked up Saturday in Yangon and elsewhere.