Thai forces fired rubber bullets and tear gas during a stand-off with Cambodian protesters along their disputed border Wednesday, Bangkok's military said, a move that Phnom Penh stated injured more than 20 people.

The neighbours agreed a truce in late July following five days of clashes that killed at least 43 people on both sides -- the latest eruption of a long-standing dispute over contested border temples on their 800-kilometre (500-mile) frontier.

Since then, both sides have traded accusations of ceasefire violations.

Army personnel were laying barbed wire on the border in Sa Kaeo when around 200 Cambodians gathered to protest, the Thai military said in a statement.

"It became necessary to use tear gas and rubber bullets to control the situation, and make the crowd pull back from

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