Police also were seen pointing guns toward protesters.

Demonstrators retaliated by throwing bricks, said a rescue team member who assisted with the injured. It wasn't clear exactly how many students were rounded up, but estimates put the figure at between 20 and 40.

On February 1, the military, led by Min Aung Hlaing, led a coup against the democratically elected government of Aung San Suu Kyi, detaining key government officials and forming a new military junta.

"We are keeping Daw Aung San Suu Kyi and (president) U Win Myint at a safer place for their security".

Meanwhile, Suu Kyi's lawyer told reporters in Naypyitaw on Monday that a judge informed him that the ousted leader's detention was now due to last until Wednesday.

A convoy of motorbikes and cars drove through the capital Naypyitaw.

Nuns from various congregations have shown solidarity with the people of Myanmar by marching on the streets, saying prayers at convents and offering snacks to protesters in Yangon and elsewhere.

Myanmar military generals on Tuesday choked the internet for the second consecutive night as protesters continued their demonstrations as extra troops were deployed around the country.

Protests on Monday were smaller than the hundreds of thousands who had joined earlier demonstrations but broke out in many parts of the Southeast Asian country, where the coup has halted a decade of unsteady transition to democracy.

Myanmar's generals imposed a second straight overnight internet shutdown into Tuesday, ignoring worldwide condemnation as they worked to grind down a popular uprising against their coup.

He said the protests were harming stability and spreadingfear and the campaign of civil disobedience amounted to theillegal intimidation of civil servants.

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Some carried banners against the military that read: "They kill in the day".

The military cited numerous election irregularities in November's election which Suu Kyi's party achieved a landslide victory.

Suu Kyi's lawyer and her National League for Democracy party have said they have not been able to make direct contact with her, though they believe she is under house arrest in her Naypyidaw residence.

Protesters outside the Central Bank of Myanmar building in Yangon, Myanmar.

On Monday in Mandalay, soldiers and police violently broke up a gathering of more than 1,000 protesters in front of the Myanmar Economic Bank. Large demonstrations have been held across the country every day since February 6. The military said Sunday night that "the army, police and fire departments will work together to assume responsibility for maintaining security".

An order on Sunday that appeared to be from the Ministry of Transport and Communications told mobile phone service providers to shut down internet connections from 1am to 9am Monday.

But the monitor noted that most users in Myanmar were still barred from social media.

United Nations' Secretary-General Antonio Guterres said in a released statement that he was "deeply concerned" about the situation in the country, "including the increasing use of force and the reported deployment of additional armored vehicles to major cities". There are numerous unconfirmed reports of other arrests.

"Ms Schraner Burgener has reinforced that the right of peaceful assembly must fully be respected and that demonstrators are not subjected to reprisals", U.N. spokesman Farhan Haq said at the United Nations.

"She has conveyed to the Myanmar military that the world is watching closely, and any form of heavy-handed response is likely to have severe consequences".