Heavy combat between Thailand and Cambodia has entered a second week, with Cambodia claiming Thai bombing is hitting deeper into its territory.

Cambodia has accused Thailand of spraying poisonous gas from a drone near villages along their shared border amid ongoing clashes that began on December 7, although the type of chemical used was not specified.

Thailand will hold a general election on Feb. 8, with pre-poll surveys signaling a fractured mandate as outgoing Prime Minister Anutin Charnvirakul bets that the intensifying armed conflict with Cambodia will bolster support for his conservative party.

The two sides are battling over longstanding competing claims to patches of frontier land, some of which contain centuries-old temple ruins.

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Thailand and Cambodia trading accusations of attacks on civilians. The death toll from renewed clashes climbing to 31, as fighting enters a second week. Cambodia says Thai forces penetrated more than 70 kilometres into its territory.

China calls for utmost restraint and every possible measure conducive to a ceasefire to ensure de-escalation of tensions as soon as possible amid the ongoing Cambodia-Thailand border clashes.

Cambodia accused Thailand on Monday of striking deep inside its territory, bombing areas less than a two-hour drive from the country's main tourist draw, the centuries-old Angkor temples, in a