The projected messages, reading “finding the truth”, also went viral on social-media.
Though police are guarding the sites where the messages were projected, no moves have been made to prosecute those behind the campaign.
Metropolitan Police chief Pol Lt-General Pakkapong Pongpetra said police was collecting evidence to see if the expression of such messages violated other people’s rights.
Meanwhile, authorities are tracking down the 40 or so people who attended the memorial ceremony for Khattiya “Seh Daeng” Sawasdipol – an Army major-general who supported the red-shirt movement and was shot in the head on May 13, 2010 while being interviewed by a New York Times journalist.
The attendees of the memorial will be prosecuted for allegedly violating the emergency decree.
Red-shirt activist Anurak Jeantawanich, 51, was arrested for allegedly organising the ceremony, but he denied the allegation and has been let out on a bail guarantee of Bt30,000.