UNITED NATIONS (AP) — The U.N. humanitarian aid chief says the number of Syrians in need is expected to jump "significantly" in the coming weeks as her office releases its latest measures of the three-year crisis.

Valerie Amos, however, provided no reason for the expected jump while talking to reporters Wednesday.

The United Nations already estimates that 9.3 million people in Syria urgently need humanitarian assistance, and more than 6.5 million are internally displaced.

U.N. Security Council members are working on a draft resolution that would authorize the delivery of humanitarian aid into Syria through four border crossings without approval from the Assad government.

Amos says international donations for aid are "way down" this year, with just $450 million received out of a $2.3 billion appeal.