He said he was freed after army officers invited him to a meeting and asked him not to make any movement that could incite disturbance or affect the reconciliation atmosphere.
But he said later that he would continue with his movement to call for a probe into the missing plague of the 1932 coup makers embedded at the Royal Plaza.
Meanwhile Dusit station police have sealed off the area where the plague was embedded and banned entry to the place as activists planned activities at Dusit police station to find out the missing plague.
They also planned to go to the Bangkok Metropolitan Administration headoffice to demand the checking of CCTV cameras in the area to find which agency removed the plague.
Bangkok governor Pol Gen Asawin Kwanmuang denied knowledge of the removal but said activists could seek approval from the BMA Traffic and Transport Department to see the CCTV footage.