The UN refugee agency warned on Thursday there could be as many as 700,000 Syrian refugees fleeing the war-torn nation by the end of the year as it stepped up its call for emergency funding.
"There may be up to 700,000 Syrian refugees in neighbouring countries by the end of the year,"
Panos Moumtzsis, the UNHCR's chief coordinator for Syrian refugees, told reporters in Geneva.
"We are running out of time," he added.
Faced with the soaring need for aid after 18 months of brutal conflict in Syria, humanitarian agencies upped their call for funds to $487.9 million (379.2 million euros) to sustain operations until the end of the year.
In June, when the UNHCR first updated its regional response plan, it made plans for 185,000 refugees. Since then the number has tripled, the agency said, with 100,000 people fleeing Syria in August and 60,000 so far in September.
At present, only $141.5 million in funding is available, just 29% of the overall request, Moumtzsis said, stressing the urgency of the appeal in the face of an "overwhelming increase" in the number of people trying to escape the escalating bloodshed.
The approach of winter made Thursday's appeal even more important, Moumtzsis said, adding that winterised tents, clothing, blankets and heaters were needed to prepare for the "very harsh" months to come.
"We've been overwhelmed," said Moumtzsis. "We need the funding urgently to respond as thousands of people are crossing the border."
Aid agencies were struggling to keep up with the constant exodus, which he put at a rate of 1,000 people a day and sometimes up to 2,000.
Funding is essential to provide basic life-saving aid for those crossing the borders, Moumtzsis said, adding that a focus on education and healthcare was also necessary given the high ratio of child refugees fleeing Syria.
The UN children's agency UNICEF also took part in the joint appeal, saying that more than 50% of the refugees were under the age of 18 and one fifth were under five.
Save The Children said there was a "disproportionate number of women and children in need" in the neighbouring countries hosting refugees: Iraq, Jordan, Lebanon and Turkey.
Women and children accounted for around 75% of the refugees overall, but in Jordan's Zaatari camp, children accounted for 65 percent of the population, the charity's emergency programmes director Michael Penrose said.
"The message we are getting on the ground is that host governments and communities have shown a great deal of welcome (to Syrian refugees), but they are stretched," he said.
It took weeks to build such camps, Moumtzsis said, "but days and hours to fill them".
Earlier this week, Save the Children said it has collected "shocking testimony" from Syria showing that "children have been the targets of brutal attacks, seen the deaths of parents, siblings and other children, and have witnessed and experienced torture".
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