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came under renewed pressure Tuesday as the world's wealthiest nations condemned the junta for responding to anti-coup demonstrators "with violence", a rebuke coming on the heels of tightened sanctions from Washington and .

Authorities have gradually ratcheted up their against a massive and largely peaceful civil disobedience campaign demanding the return of ousted leader .

Three anti-coup protesters have been killed in demonstrations so far, while a man patrolling his Yangon neighbourhood against night arrests was also shot dead on the weekend.

"Use of live ammunition against unarmed people is unacceptable," the foreign ministers of the G7 group of rich democracies - comprising Canada, France, Germany, Italy, Japan, Britain, the United States together with the EU -- said in a statement Tuesday.

"Anyone responding to peaceful protests with violence must be held to account," they said, calling for Myanmar security forces to "exercise utmost restraint and respect human rights and international law".

The sharp condemnation comes after the overnight blacklisting of another two members of the regime by the United States - air force chief Maung Maung Kyaw and fellow junta member Moe Myint Tun - after announcing targeted sanctions against other top generals earlier this month.

"We will not hesitate to take further action against those who perpetrate violence and suppress the will of the people," Secretary of State Antony Blinken said.

Hours before, the European Union had also approved sanctions targeting Myanmar's military and their economic interests, with EU foreign policy chief Josep Borrell saying that financial support to the government reform programmes is "withheld".

Protesters continued staging rallies across Myanmar, though commercial hub Yangon saw much smaller numbers massing at key junctions on Tuesday.

In the northern Kachin city of Myitkyina - which has seen bursts of violence from authorities - protesters rode their motorbikes across town waving the Myanmar flag and flashing a three-finger salute, a symbol of resistance.

Mandalay saw a more sombre crowd at the funeral of Thet Naing Win, a 37-year-old man shot and killed Saturday when security forces opened fire into a crowd of anti-coup protesters.

"I beg for all to help see that my husband's case is ruled with justice," said his widow Thidar Hnin, adding that she wants to see "the dictator dethroned".

"This country is owned by the citizens," she told AFP.

'Pray for them'

More than 680 people have been arrested since the February 1 coup, according to the Assistance Association for Political Prisoners monitoring group, with nearly all still behind bars.

Overnight internet shutdowns have also become routine, fanning fears of anti-coup protester arrests during the blackouts.

In recent weeks, the Myanmar military has deployed tear gas, water cannon and rubber bullets against protesters, with isolated incidents of use of live rounds.

They have also stepped up the presence of security forces in Yangon, Myanmar's largest city.

The crackdown has failed to quell weeks of massive street demonstrations, joined by large numbers of striking civil servants, bank staff and healthcare workers.

Tens of thousands rallied on Monday in the capital Naypyidaw, a military stronghold. More than 100 people were arrested as police chased protesters through the streets.

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Demonstrators in Yangon ignored security forces and barricades set up around the city to hold impromptu vigils for protesters killed in the unrest.

"We can only pray for them," said student Thura Myo. "Even when we are sad, our voices will be heard by the international community."

The civil servants' boycott has choked many government operations, as well as businesses and banks and at the weekend the junta gave its most ominous warning yet that its patience was wearing thin.

"Protesters are now inciting the people, especially emotional teenagers and youths, to a confrontation path where they will suffer the loss of life," said a message aired on state media.

Suu Kyi has not been seen since she was detained in a dawn raid but has been hit with two charges by the junta, one of them for possessing unregistered walkie-talkies.

Her hearing is expected on March 1.

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