In a statement released on Tuesday, (May 6), the agency said almost 20,000 people -- mostly exhausted and traumatized women and children -- have arrived in eastern Chad the past two weeks alone.

The sharpest rise was recorded at the Tiné border crossing in Wadi Fira Province, where almost 6,000 people arrived in just two days, UNHCR said.

"Since April 21, over 14,000 individuals have been counted in Wadi Fira, including 12,000 in the last week, but also 5,300 people in Ennedi Est over the past fortnight, including 1,000 on Sunday alone," Magatte Guisse, UNHCR's representative in Chad, was quoted as saying by the agency during a press briefing in Geneva.

"This sudden influx reflects the escalating violence in Sudan's North Darfur region, particularly in and around El Fasher, which is triggering mass displacement at an alarming pace."

Read AlsoSudan: 400,000 forced to flee Zamzam camp in Darfur

Latest movements following attacks by armed groups in North Darfur

The latest movements of people have been in response to a sereis of brutal attacks by armed groups in North Darfur, where assaults on displacement camps -- including Zamzam and Abu Shouk -- and El Fasher town have caused widespread terror, UNHCR explained.

The organization said displaced people arriving in Chad report that over 10,000 people are still en route, desperately trying to reach the border to escape the violence.

"Many of the newly arrived refugees report experiencing grave violence and human rights violations that forced them to flee.They describe men being killed, women and girls subjected to sexual violence, and homes burned to the ground. Their journeys to safety were perilous, with refugees facing robbery and extortion at checkpoints and repeated threats along the way," Guisse was quoted as saying in the statement.

Read AlsoAfter 2 years of war, Sudan no closer to peace

Most reached Chad with no personal belongings or IDs

Most arrived in Chad with nothing -- no food, money, or identification, UNHCR reported. Several wounded individuals, including children and elderly women, reportedly fell from vehicles during the chaotic escape.

The UN agency said that a rapid protection assessment by UNHCR and its partners indicates that 76 percent of the newly arrived refugees were subjected to serious protection incidents, including extortion, theft and sexual violence.

At the same time, protection teams at the border have identified increasing numbers of people with specific needs -- including 752 at-risk children, 22 of whom were injured in the conflict, as well as unaccompanied children, pregnant and breastfeeding women, and elderly survivors.

Despite extraordinary efforts by local communities and authorities, the capacity to absorb the new arrivals is severely overstretched, UNHCR warned.

Chad already hosts 1.3 million refugees, including 794,000 arrivals from Sudan since the conflict started more than two years ago. While the country continues to show remarkable solidarity in hosting refugees, it cannot bear this burden alone.

Humanitarian resources across the country remain extremely limited, while needs continue to grow for water, shelter, health, education and protection, noted the UN agency.

Read AlsoSudanese war refugees recount Libya horrors

UNHCR urges international community to urgently support humanitarian response

"Since April 23, eight convoys have relocated almost 1,850 newly arrived refugees to Iridimi, a site in Wadi Fira Province. UNHCR and partners are delivering life-saving assistance at border points and relocation sites, but current efforts remain far from sufficient given the scale of the crisis," said the UNHCR representative in Chad.

"Attacks on civilians in Sudan must end, and safe passage needs to be allowed to those fleeing for their lives," said Guisse.

UNHCR has called on the international community to urgently step up support for the response.

"Of the 409 million dollars [around 362 million euros] required to respond to the refugee crisis in Chad in 2025, only 20 percent has been funded to date. We urgently call for increased solidarity and immediate funding to ensure these vulnerable populations receive the protection and assistance they need, now," concluded the UNHCR official.