Thirteen people were killed with 25 others injured in a mishap which involved two buses in Mandalay region, Xinhua reported.
The accident took place in Thabeikkyin township in the early hours of Tuesday.
Of the two express buses travelling to Shwegu township, Kachin state, one bus lost control and overturned near Kyaukkyi village in the township.
The other bus later collided with a nearby tree while attempting to avoid hitting the former overturned bus in the front.