Protesters will test Thai coup leader General Prayuth Chan-ocha this weekend after he said there would be no elections in Thailand for more than a year to give the military time to engineer reforms.
Police sealed off a Bangkok intersections to prevent a planned protest. Authorities said they would not allow any protests against last week's military coup.
Former Prime Minister Yingluck Shinawatra was in a "safe place" on Saturday, an aide said, after being held by Thailand's army following its seizure of power this week, as opposition to the coup grew among her supporters and pro-democracy activists.
The US has suspended about $3.5 million in military assistance to Thailand following a coup, the State Department said Friday.
Later, the military summoned ousted Prime Minister Yingluck Shinawatra and 22 associates including powerful relatives and ministers in her government, to a meeting at an army facility at 10 a.m. on Friday.
Thai army chief Prayuth Chan-ocha has declared himself acting Prime Minister until someone else is appointed to the post.