Cyber hackers infiltrated four police websites in Thailand on Monday night and left messages demanding justice. The websites included that of the Metropolitan Police, the Pichit Police Office, the Police Clearance Certificate Centre, and Office of Communication and Communication Technology of the Royal Thai.

Major General Siripong Timula, commander of the Technology Crime Suppression Division reportedly said: “The hactivists involved were from abroad and they stole no information from the websites they hacked.” He added that they will likely be charged under the Computer Crimes Act.

The hacked websites showed a black page with a hashtag “Boycott Thailand” and the image of a white mask with blank eyes and the words, “Blink Hacker Group, Failed Law, We want Justice and Greetz Myanmar Black Hats”.

Police Tuesday said they were investigating whether the incident was in response to a Thai court decision that has been widely protested in neighboring Myanmar. Protesters have rallied in Yangon outside the Thai Embassy and at border crossings demanding a review of the evidence in the case.

The Dec. 24 ruling resulted in death sentences of two Myanmar men convicted of murdering two British backpackers, David Miller, 24, and Hannah Witheridge, 23, whose bodies were found on the island of Koh Tao on Sept. 14, 2014.

Protesters believe the men were victims and threatened to boycott Thai goods after a trial that raised many unanswered questions about police and judicial conduct in Thailand.

Thai Police rushed to solve the crime, under intense pressure to limit negative publicity to the tourism industry. But the investigations and trial drew widespread criticism and police were criticized for not properly securing the crime scene, conducting more than 200 random DNA tests, releasing names and pictures of suspects who turned out to be innocent, mishandling crucial DNA evidence from the victims, and allegedly torturing their prime suspects.