Saturday’s incident is the third time in a few weeks that Thai soldiers have been injured by mines while patrolling along the border.

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 army’s statement said the incident took place in Thailand’s Sisaket province and “clearly demonstrates to both domestic and international society that the use of concealed weapons in border areas continues to exist,

Thailand’s army said three soldiers were injured in a landmine blast near its disputed border with Cambodia, threatening a fragile ceasefire agreement between the two neighbors.