Thailand’s military accused Cambodian forces on Wednesday of breaching a ceasefire agreement at three separate locations along the disputed border, warning that continued aggression could compel Thai forces to respond more decisively.

Thai and Cambodian leaders are meeting in Malaysia in an urgent effort to resolve deadly border clashes that entered a fifth day despite mounting international calls for peace.

"Cambodian forces used small arms and grenade launchers, prompting Thailand to respond in self-defence," Thai army spokesman Major-General Winthai Suvaree told reporters.