YANGON, Feb. 14 (Xinhua) -- An ethnic armed group of Myanmar, the Restoration Council of Shan State (RCSS), has robbed a military vehicle in eastern Shan state, Myanmar News Agency reported Thursday.

Members of the RCSS, also known as Shan State Army (SSA), stopped a military vehicle carrying two commanding officers between Mongyin and Kengtung, and took away things on the car on Tuesday, the military's True News team was quoted as saying.

The RCSS is an ethnic armed organization which signed the Nationwide Ceasefire Accord (NCA) with the government on Oct. 15, 2015.

The military said in a statement that the armed group's robbery is an opposite challenge to the eternal peace, warning that the military will take action if the armed group does not return their properties.

The Myanmar military announced suspension of all its military actions against armed groups in operation areas in five military command regions for four months starting from Dec. 21, 2018 to April 30, 2019 to pave way for political talks with the non-ceasefire signatory armed groups.