BANGKOK (Reuters) -A landmine explosion on the contested Thai-Cambodia border that has threatened to derail a U.S.-brokered truce is scheduled to be investigated by ASEAN observers on Friday, Thailand said, a day after Malaysia’s Foreign Minister said a regional team had reported that mines found at the site of the incident were new.

Thailand has suspended the ceasefire deal and demanded an apology from Cambodia after accusing it of laying fresh PMN-2 landmines, one of which maimed a Thai soldier on Monday in Kantharalak district of Thailand’s Sisaket province, which is opposite Cambodia’s province of Preah Vihear.

Cambodia has denied the charge and urged Bangkok to adhere to the truce agreement signed in Malaysia late last month. The truce established an observer team, made up of milit

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