Demonstrators threatened on Tuesday to spend another night in front of Thammasat University after a two-hour standoff with police that blocked them from marching to Government House.
The group of several hundred protesters demanding that an election be held this year spent Monday night camped out at the school’s Tha Prachan campus.
They planned to reach Government House, read a statement calling for an election sooner than planned, and then disperse.
But hundreds of police officers blocked their way just outside the campus.
Ignoring rain that began falling at about 11am, the protesters remained in the roadway, insisting on their right to march.
Several demonstrators were overcome by the heat and were taken to hospital for treatment.