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The UN voiced concern Friday that conditions were so dire in Syria that some Lebanese residents who had fled there seeking refuge from the Israel-Hezbollah war were opting to return to Lebanon.

There are "Lebanese families who are beginning to take the very difficult and potentially life-threatening decision to return to Lebanon", said Gonzalo Vargas Llosa, the United Nations refugee agency's representative in Syria.

"These are very, very small numbers, but for us, even small numbers are worrying signals," he told reporters in Geneva via video link from the Syrian-Lebanese border.

The UNHCR estimates that around 560,000 people have fled into Syria from neighbouring Lebanon since late September, when months of cross-border fire between Israel and Hezbollah over the war in Gaza escalated into all-out war.

Lebanese authorities put the number even higher, at more than 610,000.

Vargas Llosa said that around 65 percent of those crossing into Syria -- itself torn apart by 13 years of civil war -- were Syrian nationals who had sought refuge in Lebanon from that conflict.

He pointed out that from 2017 up to September 23 this year, around 400,000 Syrians had returned to their country from Lebanon.

"We have had more or less the same number... in a period of seven to eight weeks," he said, adding that some 150,000 Lebanese had also arrived in Syria during that period.

'Extremely worrying'

He hailed the "exemplary" and "extraordinary display of generosity" shown towards those arriving by communities across Syria, "whose infrastructure is destroyed, whose economy is destroyed".

But he warned that given Syria's own "catastrophic economic situation... it is unclear for how long this generosity will last".

Worrying signs were already emerging, he said, pointing to the admittedly small numbers of people who were opting to return to Lebanon despite the risks.

Those were leaving because they thought "the conditions in Syria are appalling, and that they may be better off in Lebanon, in spite of the bombings".

Back in Lebanon, they might have better support systems, easier access to services and even the ability to generate a little income, he said.

"The numbers we're encountering at the borders are very small, maybe an average of 50 families a day," he said.

But Vargas Llosa warned that "unless there is a real injection of international support... this number of Lebanese choosing to return home to these extraordinarily difficult circumstances may grow in the coming weeks and months".

"This would be extremely worrying."

There were even some Syrian returnees who were opting to once again cross back into Lebanon, "primarily because of the extraordinarily dire economic conditions here in Syria", Vargas Llosa said.

In the meantime, he said that there had recently been "an important decrease in the pace of arrivals" into Syria, from a peak of 10,000-15,000 per day to an average now of about 2,000.

Vargas Llosa charged that this was likely linked to Israel's repeated bombings of border crossings.

"Syrians and Lebanese are very scared of using these escape routes," he said, appealing to the Israeli military to "immediately stop these unacceptable attacks".