Travel ban imposed on scores of people

• NEW: The military has imposed a travel ban on scores of people


• Ex-Prime Minister Yingluck arrives at a military compound in Bangkok, a source says


• The generals have summoned Yingluck and scores of others to report to authorities


• The military took power in a coup Thursday after months of unrest

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Bangkok, Thailand (CNN) -- The Thai military on Friday tightened its grip on the politically unstable Southeast Asian nation, banning more than 150 prominent figures from leaving the country and threatening to arrest leaders who disobey its orders.

Former Prime Minister Yingluck Shinawatra was among those who reported Friday to the military junta that seized power in a coup Thursday after months of turmoil that paralyzed much of the government and caused deadly clashes in the streets of Bangkok.

The United States and several other countries have criticized the intervention, calling for the swift restoration of democracy.

I'm in #Bangkok where the military has summoned foreign diplomats, bans 155 politicians and activists from leaving the country tune in #CNN

— Saima Mohsin (@SaimaMohsin) May 23, 2014

Yingluck, whose government was in power when the unrest began in November, was removed from office earlier this month by the country's Constitutional Court over the appointments of top security officials.

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She arrived Friday at a military compound in Bangkok with one of her sisters, a source close to Yingluck told CNN. The military had on Thursday summoned Yingluck three other members of her politically powerful family to report to authorities Friday.

It has also called on more than 100 other people, including prominent figures on both sides of Thailand's political divide, to come to military facilities. Those who don't report, it has warned, will be arrested.

Military officials haven't provided much explanation about the reasons for the summonses, saying it's necessary "to ensure smooth operation of restoration of peace and order."

They have also placed travel bans on Yingluck and scores of other people.

The junta on Thursday detained some of the leaders of the country's deeply polarized political factions. Some of those held, including opposition leader Abhisit Vejjajiva and members of Yingluck's Pheu Thai Party, were later released.

Constitution ditched, curfew imposed

Gen. Prayuth Chan-ocha, the head of the military, has assumed the powers to act as Prime Minister until a new one takes office, the military said in a statement Thursday.

Yellow shirts protest camp was there for months. Like a city within a city. It will take time to clean up #ThaiCoup http://ift.tt/1t1H0wI

— Paula Hancocks (@PHancocksCNN) May 23, 2014

How exactly the government will operate remains unclear, given that the military also has thrown out the constitution it drew up in 2007 after a previous coup, except for Section 2, which acknowledges that the King is the head of state.

The last six months have been marked by large-scale protests, both by those backing Yingluck's government and those opposed to it. There have been periodic outbursts of deadly violence in the streets.

Protest camps of both sides in Bangkok have been cleared away since the coup.

In Thailand, TV channels including CNN have been replaced with this: http://t.co/IJDcAGA9xP #ThaiCoup http://ift.tt/1kvOLdB

— CNN International (@cnni) May 23, 2014

Under the new order, schools will be closed nationwide between Friday and Sunday, the military said. A curfew is in place between 10 p.m. and 5 a.m. And all state-run, satellite and cable TV providers have been ordered to carry only the signal of the army's television channel; CNN is among those networks that have been taken off the air.

In a speech Thursday, Prayuth explained that these actions were necessary to restore order and push through reforms.

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CNN's Kocha Olarn reported from Bangkok, and Jethro Mullen wrote from Hong Kong. CNN's Paula Hancocks, Simon Harrison and Greg Botelho contributed to this report.