Six Thai government websites were hacked on Monday by an Islamist group calling itself "Fallag Gassrini and Dr Lamouchi" from Tunisia, the media reported.
The hackers attacked the official sites of Lamphun, Sing Buri, Sa Kaeo and Tak provinces, as well as Mahasarakham University's publishing house and Lam Luk Ka Hospital in Pathum Thani, te Bangkok Post reported.
Pictures of Rohingya Muslims fleeing persecution in Myanmar and Muslim child victims of bomb attacks were posted on the sites.
The hackers left messages saying; "Your sites have been hacked by Fallag Gassrini and Dr Lamouchi hacker group from Tunisia."
"We, the Fallaga team, are Muslims, we are peace-loving people."
According to sources, the hacker group previously worked with other Islamist groups and hacked several Israeli and French websites.
Thailand's information and technology ministry has launched a probe to trace the group's location.