Long-simmering tensions between Thailand and Cambodia escalated to deadly violence on July 24, setting off five days of military clashes at multiple spots along the roughly 800-kilometer (500 mile) border.

An ASEAN interim observer group on Sunday launched the second-round two-week-long inspection at conflict-hit areas on the Cambodia-Thailand border, a Cambodian defense spokesperson said.

Thailand's army sent home two Cambodian soldiers from a group of 20 on Friday, ahead of a key meeting in Malaysia next week where defence ministers and military commanders will hold talks aimed at maintaining a ceasefire along their disputed border.