GENEVA -- The United Nations on Thursday increased its funding appeal for Syrians who have fled the conflict in their country to almost $490 million, warning that the number of refugees could rise to over 700,000 by the end of the year.

So far donors have given $141.5 million toward humanitarian assistance for the estimated 294,000 Syrians who have fled abroad, the U.N. refugee agency and 51 other aid groups said in a joint appeal.


"We only have one-third of the funding we need to respond," said Panos Moumtzis, Syria coordinator for the U.N. High Commissioner for Refugees. "We are running out of time and we need to respond."

Aid groups had previously estimated that 100,000 Syrians would have crossed into neighboring Jordan, Lebanon, Iraq and Turkey by the end of 2012.

But with no end in sight to the 18-month conflict and 2,000 to 3,000 Syrians crossing daily into neighboring countries, humanitarian groups are preparing to help up to 710,000 by year end, said Moumtzis. This includes Syrians who have already fled abroad but have yet to come forward to register as refugees.

Almost 95,000 Syrians have found refuge in Jordan, followed by almost 88,000 in Turkey and 78,000 in Lebanon. Some 33,000 Syrians have fled to Iraq, which recently reopened its border crossing at al-Qaim.

See how you can help at UNHCR.

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  • Free Syrian Army fighter takes cover in a building during clashes against the Syrian Army in Aleppo, Syria, Tuesday, Sept. 25, 2012. (AP Photo/Manu Brabo)

  • In this Friday, Sept. 21, 2012, photo, a Syrian shouts slogans against the regime in front of a flag of the armed Islamic opposition group, the Nusra front, during a demonstration in the Bustan al-Qasr neighborhood of Aleppo, Syria. Arabic from the Quran reads, "There is not God but Allah, and Muhammad is his messenger." (AP Photo/ Manu Brabo)

  • In this Friday, Sept. 21, 2012, photo, a Syrian man looks at his mobile phone in the Bustan al-Qasr neighborhood of Aleppo, Syria. The Britain-based Syrian Observatory for Human Rights said Friday that nearly 30,000 Syrians have been killed during the 18-month uprising against the Assad regime. (AP Photo/ Manu Brabo)

  • In this Saturday Sept. 22, 2012, photo, a Free Syrian Army soldier stands next to a dead body in front of Dar el-Shifa hospital in Aleppo, Syria. Partial translation in Arabic reads, "Free Syrian Army." (AP Photo/ Manu Brabo)

  • In this Sunday, Sept. 23, 2012, photo, Syrian children laugh on a truck, as they flee with their family, due to fighting between Syrian rebels and government forces, in Aleppo, Syria. (AP Photo/ Manu Brabo)

  • Two Syrian men work at a bakery in the Saif al Dawla neighborhood of Aleppo, Syria, Saturday, Sept. 22, 2012. (AP Photo/Manu Brabo)

  • A Free Syrian Army soldier aims his weapon in Aleppo, Syria, Monday, Sept. 24, 2012. (AP Photo/Manu Brabo)

  • A Free Syrian Army soldier looks out a window at a buliding in Aleppo, Syria, Monday, Sept. 24, 2012. (AP Photo/ Manu Brabo)

  • In this Thursday, Sept. 20, 2012, file photo, a wounded woman, still in shock, leaves Dar El Shifa hospital in Aleppo, Syria. Two months into the battle for Syria's largest city, civilians are still bearing the brunt of the daily assaults of helicopter gunships, roaring jets and troops fighting in the streets. (AP Photo/ Manu Brabo, File)

  • Free Syrian Army fighter takes a rest in a hole on a building during an attack on Syrian Army positions in Aleppo, Syria, Tuesday, Sept. 25, 2012. (AP Photo/Manu Brabo)

  • A Syrian woman cries near Dar El Shifa hospital while the body of her son, killed by the Syrian Army, lies on the street in Aleppo, Syria, Tuesday, Sept. 25, 2012. (AP Photo/Manu Brabo)

  • A woman cries near the body of her brother in front of Dar El Shifa hospital in Aleppo, Syria, Tuesday, Sept. 25, 2012. (AP Photo/Manu Brabo)

  • A Free Syrian Army fighter holds a rocket-propelled grenade launcher while taking cover after a tank blast in Aleppo, Syria, Wednesday, Sept. 26, 2012. (AP Photo/Manu Brabo)