Western governments have warned their citizens in Myanmar to exercise extreme caution in major cities in the Southeast Asian nation amid social media reports of alleged bomb threats by ethnic armed groups operating in the wake of a temporary cease-fire collapse, RFA reported.

The U.S. Embassy in Yangon on Wednesday issued an alert to notify American citizens that Myanmar security forces are investigating reports of potential attacks in the capital Naypyidaw on Sept. 26, Oct. 16, and Oct. 26, and in Naypyidaw, Yangon, and Mandalay in the coming months.

The alert advises U.S. citizens to increase their security awareness, especially when interacting with security forces and at government facilities, and to monitor local media for updates.

The U.K., Canadian, and Australian governments issued similar warnings.