Anti-coup protesters retreat after riot policemen fire sound-bombs and rubber bullets in Yangon. File/AP

Security forces in Myanmar cracked down heavily again on anti-coup protesters Friday even as the military downplayed reports of state violence.

At least four people were killed in Bago, about 100 kilometres (60 miles) northeast of Yangon, in an attack by government troops and police that began before dawn and continued sporadically until after dark, reports on online news outlets and social media said.

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Meanwhile, Myanmar's own ambassador to the United Nations has urged "strong action" against the junta, as reports emerged of scores killed in the military's latest crackdown, according to AFP.

Myanmar's ambassador Kyaw Moe Tun addresses the Human Rights Council at the United Nations in Geneva. Reuters

The country has been in turmoil since the military ousted civilian leader Aung San Suu Kyi in February, with protesters refusing to submit to the junta regime and continuing to demand a return to democracy.

With more than 600 people killed by security forces trying to quell the movement, the international community has increasingly raised the alarm on the crisis.

During a UN Security Council meeting on Friday, Myanmar's ambassador pushed for more concrete action — proposing a no-fly zone, an arms embargo and more targeted sanctions against members of the military and their families.

"Your collective, strong action is needed immediately," Ambassador Kyaw Moe Tun told the meeting.

On the other hand, an alliance of ethnic armies in Myanmar that has opposed the junta's crackdown on anti-coup protests attacked a police station in the east on Saturday and at least 10 policemen were killed, domestic media said.

This screengrab shows a protester setting off fireworks from behind a makeshift barricade in Bago. AFP

During a UN Security Council meeting on Friday, Myanmar's ambassador pushed for more concrete action -- proposing a no-fly zone, an arms embargo and more targeted sanctions against members of the military and their families.

"Your collective, strong action is needed immediately," Ambassador Kyaw Moe Tun told the meeting.

"Time is of the essence for us," he said. "Please, please take action."

An independent analyst with the International Crisis Group also warned the council that Myanmar was "at the brink of state failure".

"The vast majority of the population does not want military rule and will do whatever it takes to prevent that outcome. Yet the military seems determined to impose its will," said Richard Horsey.

"Its actions may be creating a situation where the country becomes ungovernable. That should be of grave concern to the region and to the broader international community."

The police station at Naungmon in Shan state was attacked early in the morning by fighters from an alliance that includes the Arakan Army, the Ta'ang National Liberation Army and the Myanmar National Democratic Alliance Army, media reported.