Thai and Cambodian troops have been on high alert on Tuesday in disputed land around a 900-year-old mountaintop temple.
Soldiers on both sides held fire but dug in their positions, after four days of deadly clashes in the 4.6-square-kilometre contested area surrounding the Preah Vihear temple claimed by both south-east Asian neighbours.
The clashes have killed at least two Thais and eight Cambodians since Friday, Reuters reports.
They have also energised ultra-nationalist Thai yellow shirt protesters demanding that Thailand's government step down.
Thailand's cabinet has imposed a special security law in seven Bangkok districts ahead of protests by the nationalist yellow shirts who want a tougher line against Cambodia.