Banteay Meanchey: Fresh border skirmishes between Cambodia and Thailand stretched into a second week on Sunday after Bangkok rejected US President Donald Trump's assertion that a ceasefire had been secured to end the lethal hostilities.

The confrontation, stemming from a colonial-era boundary disagreement spanning their 800-kilometre (500-mile) frontier, has uprooted roughly 800,000 individuals, authorities reported.

"I have been here for six days, and I feel sad that the fighting continues," 63-year-old Sean Leap shared with AFP at a shelter in Cambodia's Banteay Meanchey border province on Sunday.

"I want it to stop," he added, voicing concerns over his residence and animals.

Officials confirmed at least 25 fatalities, comprising 14 Thai troops and 11 Cambodian non-combatants.

Both parties accuse one another of provoking the violence, invoking self-defence while alleging civilian-targeted assaults.

Trump, who previously endorsed a truce and subsequent pact, claimed Friday that the Southeast Asian foes had committed to suspending combat.

Thai officials later clarified that no such agreement existed, with both sides reporting Sunday morning engagements.

Thai defence ministry spokesman Surasant Kongsiri stated Cambodia unleashed shells and bombs on multiple border regions overnight.

Cambodia's defence ministry spokeswoman Maly Socheata countered that Thailand persisted with mortar and bomb strikes into frontier zones since midnight.

Closed border crossings

Following the failure of Trump's anticipated truce, Cambodia sealed its Thailand border points on Saturday, stranding migrant labourers.

Beneath a temporary canopy at a Cambodian evacuation hub in Banteay Meanchey, Cheav Sokun informed AFP that her husband in Thailand sought to return.

She and her son fled Thailand with tens of thousands of fellow Cambodian workers amid July's fatal clashes, but her partner remained employed as a gardener under a "good Thai boss".

"He asked me to return first. After that, the border was closed, so he cannot come back," the 38-year-old explained.

"I worry about him, but I tell him not to go around... We are afraid that if they know that we are Cambodians, they would attack us," she said.

In Thailand's Surin province across the line, 38-year-old music teacher Watthanachai Kamngam described to AFP witnessing rockets streak through the pre-dawn sky Sunday, followed by distant blasts.

Wattanachai has been muraling vibrant depictions of tanks, Thai flags, and troops aiding the injured on bunker walls since July's deadly exchanges that claimed dozens of lives.

"As I live through the fighting, I just want to record this moment -- to show that this is really our reality," he told AFP last week.

Amid ongoing clashes, Thai forces enacted an evening curfew from 7:00 pm to 5:00 am (1200 to 2200 GMT) in sections of Sa Kaeo and Trat provinces.

The United States, China, and Malaysia, as ASEAN chair, arranged a July ceasefire.

In October, Trump supported a subsequent joint statement from Thailand and Cambodia, promoting new commerce pacts after the truce extension.

Thailand withdrew from the deal the next month after landmines injured its soldiers at the border.

Trump vowed last week to "make a couple of phone calls" to revive the prior truce.

Thai Prime Minister Anutin Charnvirakul told reporters Saturday that Trump "didn't mention whether we should make a ceasefire" in their Friday discussion.

Anutin noted "no signs" Trump would link future US-Thailand trade negotiations to the dispute, though the US leader promised Thailand "better benefits than other countries".

With inputs from AFP