Uthai Yodmanee and Nitithorn Lamlua, leaders of the Network of Students and People for Thailand Reform (NSPTR), said metropolitan police failed to keep their promise to ensure security for demonstrators at Urupong intersection.
Several protesters were rushed to a hospital after a poison ivy-like plant was scattered into the rally site Monday night, Mr Uthai said.
He said the protesters would march to Siam Square and adjacent areas to urge students and the wider public to join the demonstration
“If the number of demonstrators reaches at least 10,000 people, we will submit a letter to the prime minister, calling for a transfer of Metropolitan Police Commander Kamronwit Thoopkrachang,” he said.
He said the group would set Sunday as the deadline for the prime minister’s response and further social action would be taken if no reply was given.
Mr Uthai rejected an allegation that the demonstration at Urupong has created inconveniences to the public, insisting that traffic could flow and roads were not closed as claimed by the Centre for Administration of Peace and Order (CAPO).
He said he was legally elected as leader of the Ramkhamhaeng University Students Administrative Organisation and authorised to organise the rally.
The Students Federation of Thailand earlier attacked the NSPTR for organising the demonstration.