Myanmar authorities have rolled out additional security measures in major cities following recent alleged bomb threats by ethnic armed groups, with special squads patrolling busy public areas after Western nations issued alerts following the release of a leaked memo about possible attacks, RFA reported.

The classified security memo issued by the President’s Office in mid-September identified Sept. 16, 26 and Oct. 16 as dates set by some ethnic armed groups for attacks in Naypyidaw, Yangon, and Mandalay, and instructed government offices to increase their safety measures.

The classified letter said that a group of 20 members from four ethnic armies planned the attacks at a meeting in northern Thailand on Aug. 30.