There were other clashes on Monday, including in Yangon, where demonstrators were undaunted by a heavy military presence and an overnight internet blackout.
Protesters in Myanmar kept up demands on Monday for the release of ousted leader Aung San Suu Kyi and an end to military rule, undaunted by the deployment of armoured vehicles in several parts of the country and tougher laws aimed at cowing dissent.
An internet blackout last weekend failed to quell resistance that has seen huge crowds throng big urban centres and isolated frontier villages alike.
"There are indications of military movements in Yangon and the possibility of telecommunications interruptions overnight", according to the embassy's official American Citizen Services account.
The government did not respond to requests for comment.
But it announced late Sunday on its site that it is "not possible for Telenor to disclose the directives we receive from authorities".
Security forces fired at protestors outside a power plant in northern Myanmar in an attempt to break up the crowd.
Local media outlets said at least five journalists monitoring the protest were detained and published pictures of some people wounded in the incident. The journalists had been covering the demonstrations.
A statement signed by an array of foreign ambassadors in Myanmar said: "We call on security forces to refrain from violence against demonstrators and civilians who are protesting the overthrow of their legitimate government".
"To the people of Myanmar, we express our support for your rights to justice, to freedom, to democratic participation, to personal safety and security, and to peaceful, sustainable and inclusive development", Nada Al-Nashif, deputy high commissioner for human rights, told the council. "The world is watching".
"Those who receive them will (face) action in accordance with the law".
Among those named was Min Ko Naing, a one-time leader of bloodily suppressed protests in 1988, who has made calls supporting the street demonstrations and a civil disobedience campaign.
The lawyer was also told that her hearing is expected to take place within days via video conferencing.
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"They could crack down forcefully and we will have to be prepared".
Neither has been publicly seen since the coup, though Ms Suu Kyi's party has heard that she is "in good health".
When the military seized power, it detained Suu Kyi and members of her government and prevented recently elected lawmakers from opening a new session of Parliament. At least 400 people have been detained so far, Reuters reported, quoting the monitoring group Assistance Association for Political Prisoners.
The march came as tens of thousands took to the streets of Myanmar on Sunday in a ninth straight day of protests.
But seven police officers broke ranks to join anti-coup protesters in the southern city of Dawei, mirroring local media reports of isolated defections from the force in recent days.
People's anger has been fuelled by videos uploaded on social media that showed more arrests of government critics - including a doctor who was part of the civil disobedience movement.
Some have also expressed fears that a mass prisoner amnesty this week was orchestrated to release inmates into the public to stir up trouble, while freeing up space in overcrowded jails for political detainees.
"We don't trust anyone at this time, especially those with uniforms", said Myo Ko Ko, member of a street patrol in Yangon.
In a special session at the Human Rights Council in Geneva, the original resolution presented by Britain and the European Union was revised to remove calls to bolster the ability of a United Nations rights expert to scrutinize Myanmar and for restraint from the country's military.
The U.N.'s top human rights body on Friday passed a consensus resolution urging the military to immediately release Suu Kyi and other civilian government leaders while watering down a draft text amid pressure led by China and Russian Federation.
China and Russian Federation disassociated themselves from the consensus and said the coup was Myanmar's internal affair.
The junta insists it took power lawfully and has instructed journalists in the country not to refer to itself as a government that took power in a coup.