Thailand has accused Cambodia of violating a ceasefire agreement reached on Monday after days of deadly clashes along their disputed border, but negotiations between the two sides will continue.

Thailand and Cambodia agreed Monday to an unconditional ceasefire during a meeting in Malaysia, in a significant breakthrough to resolve five days of deadly border clashes that have killed dozens and displaced tens of thousands.

Cambodia has conducted attacks at multiple locations in violation of a ceasefire deal, a Thai army spokesman said on Tuesday, a day after the two neighbours said they would halt fighting starting at midnight.