UN Secretary General Ban Ki-moon says that half of Syria's population now "urgently need humanitarian aid".
He was speaking at a donor conference in Kuwait to raise funds for the worsening humanitarian crisis.
The UN is asking for $6.5bn (£4bn) over the coming year for Syria, its biggest ever request for a single crisis.
Meanwhile, Syria's deputy foreign minister has said Western intelligence agencies have visited Damascus to discuss combating radical Islamists.
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