Seven million Syrian have been displaced by the country's civil war, the head of the UN refugee agency in Syria said.
Tarik Kurdi said that five million of the displaced are still in Syria, while around two million have fled to neighbouring countries.
He added that UN assistance had been a "drop in the sea of humanitarian need" and the funding gap is "very, very wide."
More top news
Police in Bangladesh have begun a raid on a restaurant where gunmen are holding 20 people hostage.
Right-wing think tank warns leaving the UK in order to remain in the EU would turn Scotland into 'Greece without the sun'.
A poll of Britain's largest trade union, seen by ITV News, indicates more than half of those surveyed think the Labour leader should quit.