Police have launched their investigation into the event to commemorate the 30th anniversary of the Hat Yai Peace Accord in Songkla, Thailand, which was attended by former Communist Party of Malaya (CPM) members.

In a statement on their investigation, the police also called on one and all not to upload or sensationalise statements or articles about the event on the social media or other outlets.

"Any statements or articles regarding this should not be uploaded or shared on social media and such.

"The spread of such statements or materials regarding this or the CPM is feared to cause tensions and disharmony in the country.

"It is reminded that the act of uploading statements or articles regarding this matter can cause an investigation under Section 233 of the Communications and Multimedia Act (CMA).

"Police will also not hesitate to take action against any individual found to purposely sensationalise issues regarding the CPM," Bukit Aman CID chief Huzir Mohamed said in the statement.

The investigation comes after photos of individuals clad in "communist-esque" uniforms at the event were spread online. These included photographs that were taken by Malaysiakini during coverage of the event.

Huzir said police are investigating the matter under the CMA as well as Section 505C of the Penal Code, which covers statements conducing to public mischief with intent to incite any class or community of persons.

The police have before this launched an investigation into a similar event held in Kajang on Sunday, which was also attended by former CPM members.

Huzir gave his assurance that the police would conduct a fair and transparent investigation.