Bangkok accused Cambodia of planting landmines on the Thai side of the disputed border that injured soldiers on July 16 and July 23. Phnom Penh denied it had placed any new mines and said the soldiers had veered off agreed routes and triggered old landmines left from its decades of war.

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.