Two people were killed and 38 injured in a grenade attack on a pro-military rally in eastern Myanmar on Tuesday, a security official told AFP, as anti-coup protests were held across the country on the first anniversary of the military's power-grab.

No group has so far claimed responsibility for the attack, which took place as anti-coup activists marked the coup's anniversary with a silent strike and clapping protests, defying junta orders.

The military takeover that ended the Southeast Asian country's brief democratic interlude and toppled civilian leader Aung San Suu Kyi has triggered mass protests and a crackdown on dissent.

Struggling to contain the backlash and contending with daily clashes, the junta has killed more than 1,500 civilians, according to a local monitoring group. Swathes of the country are under the control of anti-coup fighters.

Myanmar opposition leader Aung San Suu Kyi could face sentences tallying more than 100 years in prison
Myanmar opposition leader Aung San Suu Kyi could face sentences tallying more than 100 years in prison AFP / STR

Residents across commercial hub Yangon and in the city of Mandalay clapped en masse at 4 pm (0930 GMT), AFP correspondents and locals said, marking the end of a "silent strike" against the coup.

"We were clapping," one Mandalay resident said. "Other houses in my neighbourhood clapped as well."

Ten people were arrested for taking part in the clapping protest in Yangon, local media reported.

The junta had ordered shops to stay open Tuesday but the streets of Yangon began emptying at 10 am, a scene that was repeated in Mandalay and the southern Tanintharyi region.

US Secretary of State Antony Blinken said 'The Tiananmen demonstrations are echoed in the struggle for democracy and freedom in Hong Kong'
US Secretary of State Antony Blinken said 'The Tiananmen demonstrations are echoed in the struggle for democracy and freedom in Hong Kong' AFP / Peter PARKS

Mandalay's famous jade market had opened in the morning but saw little traffic, a resident told AFP.

"I'm staying at home playing online games to participate in the silent strike."

A similar shutdown in December emptied the streets of cities and towns across the country, but Tuesday's was also marked by violence against the junta.

Two people were killed and 38 injured in a grenade attack as crowds returned from a pro-military rally in the eastern town of Tachileik a security official told AFP.

Before the coup -- a rally in support of Aung San Suu Kyi in 2019 as she prepared to defend Myanmar at the International Court of Justice in The Hague against accusations of genocide against Rohingya Muslims
Before the coup -- a rally in support of Aung San Suu Kyi in 2019 as she prepared to defend Myanmar at the International Court of Justice in The Hague against accusations of genocide against Rohingya Muslims AFP / STR

Local media also reported the incident that took place around noon in eastern Shan state, a region of the country that has seen comparatively little coup-related violence.

Ahead of the anniversary, the junta had threatened to seize businesses that shutter and warned that noisy rallies or sharing anti-military "propaganda" could lead to treason or terrorism charges.

"If the strike is shaping up as is reported, it is a thunderous silence, a resounding rebuke of military rule," David Mathieson, an analyst formerly based in Myanmar, told AFP.

Factfile on Myanmar's detained leader Aung San Suu Kyi.
Factfile on Myanmar's detained leader Aung San Suu Kyi. AFP / John SAEKI

On Tuesday morning, local media showed isolated flash mobs in Yangon and Mandalay, where protesters unfurled pro-democracy banners and set off flares.

Photos released by the junta's information team on Tuesday painted a picture of normalcy in the country, including competitors finishing a marathon in the southern Bago region and a religious celebration.

Undated video handouts showed pro-military demonstrations in unspecified parts of the country, some holding national flags and chanting slogans in support of the army.

Others held banners denouncing the "People's Defence Forces" that have sprung up to fight the military and dealt painful blows to junta troops with guerilla ambushes and mine attacks.

The United States, Britain and Canada unveiled coordinated sanctions on Myanmar officials Monday, including those involved in the trial of ousted leader Suu Kyi.

Washington sanctioned Attorney General Thida Oo, Supreme Court Chief Justice Tun Tun Oo and Anti-Corruption Commission chairman Tin Oo, all of whom it said were closely involved in the "politically motivated" prosecution of Suu Kyi.

Citing "unspeakable violence against civilians", the undermining of regional stability and "rampant" corruption, US President Joe Biden said he was working with allies to "hold accountable" those responsible.

But the UN's Special Rapporteur on Myanmar said the international community needed to do more.

"The fact that one year has elapsed with no Security Council Resolution imposing a comprehensive arms embargo -- as arms continue to flow to the junta and kill innocent people -- is unacceptable," said Tom Andrews.

"The people of Myanmar deserve better from the United Nations."

Suu Kyi has been detained since the coup, and faces a raft of charges from election fraud to breaching the official secrets act, and faces over 100 years in jail.

The day before the anniversary, the junta announced the Nobel laureate will face a new trial for electoral fraud during 2020 polls in which her National League for Democracy party trounced a military-backed rival.

Several senior members of the national electoral commission have also been arrested since the coup, accused of masterminding the NLD's landslide victory.

The junta cancelled the results of the 2020 election in July last year, saying it had found some 11.3 million instances of fraud.

Independent monitors said the polls were largely free and fair.