Ousted members of Thailand's former government turned themselves in to the country's new military junta Friday, as soldiers forcefully dispersed hundreds of anti-coup activists who defied a ban on large-scale gatherings to protest the army's seizure of power.

At least two activists were detained by troops during the protest in downtown Bangkok, which descended into scuffles but ended without injury and marked one of the first open challenges to the military since Thursday's coup.

The junta, though, remained firmly in charge, summoning more than 100 top political figures — the entire ousted government, their associates and a handful of their opponents. It also banned those on its wanted list from leaving the country.

Among the officials who showed up at an army compound in Bangkok by midday were former Prime Minister Yingluck Shinawatra, sacked earlier this month for nepotism by the constitutional court, and her temporary replacement Niwattumrong Boonsongpaisan, according to Yingluck's aide Wim Rungwattanachinda.

After about 30 minutes, Yingluck left the facility and was taken to another army location by soldiers, said Wim, who later added that it appeared she would not be immediately released.

THAILAND-PROTEST/

A Thai soldier stands guard while Buddhist monks beg for alms in Bangkok. (Athit Perawongmetha/Reuters)

It was unclear what the military's intentions beyond the summons, which it said had been issued "to keep peace and order and solve the country's problems."

Canada condemns coup

Foreign Affairs Minister John Baird on Thai army's seizure of power:

"This decision violates Thailand's democratic principles and stands in stark contrast to the Army's earlier assurances that its role would be limited to securing public order.

"We hope and expect the Thai military will return Thailand to civilian rule as soon as possible, respect democratic processes and the rule of law, ensure freedom of expression and assembly, and guarantee due process for those who have been detained."

By nightfall, dozens of the VIPs who turned themselves in were still being held, although at least eight ex-cabinet ministers had been released.

Prayuth Chan-ocha

Thai Army chief General Prayuth Chan-ocha said he had to act to restore stability. (Athit Perawongmetha/Reuters)

One, Education Minister Chaturon Chaisang, an outspoken critic of the military's intervention in politics, remained in hiding. Chaturon said in a Facebook post that the coup would only worsen the country's political atmosphere. He vowed not to turn himself in, but said he would not resist arrest.

Most of the country was calm, and there was little military presence on Bangkok's streets. Although life had largely returned to normal during the day, an overnight curfew from 10 p.m. to 5 a.m. was still in effect.

There were no reports of any unrest, including the former government's political strongholds in the north. In the northeast city of Chiang Mai, about 100 anti-coup demonstrators also took to the streets, but no violence was reported and the protesters dispersed on their own.

The army staged the coup Thursday just after a military-hosted meeting of political rivals to resolve the country's political deadlock.

After two hours and no resolution, armed soldiers detained the participants, including four cabinet ministers, and army chief Gen. Prayuth Chan-ocha appeared on national television to announce the takeover. Hours later, the junta suspended the constitution and banned gatherings of more than five people.

Prayuth says coup necessary

Prayuth justified the coup as a necessary move to restore stability amid increasing spasms of violence that together with controversial court rulings had rendered the government powerless.

But there are fears the power grab will only lead to more violence and simply deepen the nation's crisis.

Thailand travel advisory

There is no nationwide advisory in effect for Thailand. However, travellers should exercise a high degree of caution due to ongoing large-scale political demonstrations in Bangkok and elsewhere in the country.

There have been multiple incidents of violence associated with these protests, which have resulted in injuries and fatalities, including in areas adjacent to popular tourist sites and commercial centres in Bangkok. The risk of further violence remains high. 

Thursday's dramatic events were the latest response to a societal schism laid bare after the 2006 coup deposed former Prime Minister Thaksin Shinawatra, the older brother of Yingluck and a billionaire tycoon whose populist movement has won every national election since 2001. Thaksin lives in self-imposed exile to avoid corruption charges, but he still wields enormous influence over Thailand's political affairs and remains at the heart of the ongoing crisis.

It is a divide that has led to upheaval multiple times in recent years. The latest crisis alone has left 28 people dead and more than 800 wounded since November.

U.S. Secretary of State John Kerry condemned the takeover and warned it would "have negative implications for the U.S.-Thai relationship," but did not announce immediate punitive steps. The State Department said it was reviewing millions of dollars in aid.

"There is no justification for this military coup," Kerry said in a statement that also called for the release of detained political leaders and a return of press freedom.

British Foreign Secretary William Hague said his country looked to Thai authorities "to set out a quick clear timetable for elections to help re-establish the democratic framework of governance.

"There should never be recourse to violence: only by openly discussing the full range of issues can Thailand move forward and reach a more stable position," he said in a statement issued by the Foreign Office.