Cambodian authorities have accused Thai forces of encroaching across the border. Photo: AP PHOTO

Thai police have fired tear gas and rubber bullets at Cambodian civilians in a disputed border area, authorities in both countries say, in the most significant escalation since they declared a ceasefire to end a deadly five-day conflict in July.

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At least 23 Cambodians were injured in the incident, according to Cambodian authorities, while Thailand's military said an unspecified number of Thai officials had also sustained injuries.

The clash took place at a disputed frontier settlement w

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