International donors at a Kuwait conference on Wednesday pledged more than the targeted $1.5 billion in aid for stricken Syrians, UN chief Ban Ki-moon said.
"I am pleased to announce that pledges have exceeded the target... more than $1.5 billion have been pledged including the $184 million pledged by non-governmental organisations," Ban told a news conference.
"The exact amount of the pledges are being calculated," said the secretary general, adding: "This is the largest humanitarian conference in the history of the United Nations."
Kuwait's deputy foreign minister Sheikh Sabah Khaled al-Sabah said that "the door is open for countries that have not donated to do so".
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The conference opened with a pledge worth $300 million from Kuwait, followed by similar promises from Saudi Arabia and the United Arab Emirates.
Its initial aim was raising pledges of about $1.5 billion to provide aid to an estimated five million people affected by Syria's 22-month conflict.
Ban said the United Nations would ensure the funds were used in the most effective way, adding the international community had sent the Syrian people a message that they "are not alone".
The UN chief appealed to the two sides to stop fighting and killing, insisting there was "no military solution to this crisis... there must a political solution".