Thai protesters on Wednesday gave Prime Minister Prayuth Chan-ocha a three day deadline to step down or face more demonstrations, but the leader who made the announcement was arrested within two hours.
Prayuth had earlier said he was ready to lift emergency measures he imposed last week to stop the protests as a move to "de-escalate" the situation.
Tens of thousands of people marched to his offices at Government House. The protesters have been demonstrating for months against Prayuth and to demand curbs to King Maha Vajiralongkorn's powers.
