
Thai Army spokesman Col Akra Thiprote said the army has never contacted or knew the three men who announced the ceasefire in the recorded video broadcast on televisions on Saturday.
The army is looking for involvement of the group to the insurgency in the south, he said.
"The army plays no role in the incident or any negotiation that led to the said ceasefire. We believe that it is the job of former army chief Gen Chetta Thanajaro and his team," the spokesman said.
It would be an excellent work if the ceasefire can restore peace and stability in the deep southern provinces of Thailand.
In spite of the announcement, the army will still be on alert to provide security for people.
The three men from a group calling themselves Tai Ruam Pak Tai Khong Prathet Thai appeared on television, saying that from July 14 onwards, all the militant and political units of our group will support peace formation in Thailand.
"It has been nearly 100 years since this conflict began so we hope to bring peace back to Thailand to help the people live well."
One of the three men, speaking in a Malay dialect, claimed to be in charge of 11 sets of insurgents including known militant groups called PULO and RKK. He called on other groups to end their activities.
However, some analysts expressed doubt about the claims, which came after bombs exploded on Wednesday outside two police stations in the violent border provinces of Yala and Pattani, wounding seven people.