About 1,300 people have fled from eastern Myanmar into Thailand, officials said Saturday, as fresh fighting erupted at a border town that has recently been captured by ethnic guerillas.

Fighters from the Karen ethnic minority last week captured the last of the Myanmar army’s outposts in and around Myawaddy, which is connected to Thailand by two bridges across the Moei River, AP reported. 

The latest clashes were triggered in the morning when the Karen guerillas launched an attack against Myanmar troops who were hiding near the 2nd Thai-Myanmar Friendship

Bridge, a major crossing point for trade with Thailand, said police chief Pittayakorn Phetcharat in Thailand’s Mae Sot district. He estimated about 1,300 people fled into Thailand.

Thai officials reported people had started crossing since Friday following clashes in several areas of Myawaddy.