BANGKOK—Three Thai soldiers on patrol were wounded Saturday when one stepped on a land mine in territory along the border with Cambodia, Thailand’s army announced. The incident came just two days after the two countries reaffirmed their adherence to a ceasefire to end a brief armed conflict.

A landmine blast wounded three Thai soldiers on patrol Saturday near the border with Cambodia, days after the two sides agreed to extend the ceasefire that ended their deadliest clashes in decades. The blast occurred in Sisaket province at around 10:00 am (0300 GMT),