NEW YORK: United States: A senior U.N. humanitarian official says over 200,000 people in Syria have fled their homes in the area around Deash's (ISIS) de facto capital of Raqqa since the start of April.

The figure includes more than 30,000 people who were displaced this month alone, as U.S.-backed Syrian fighters try to oust the extremists.

Assistant Secretary-General for Humanitarian Affairs Ursula Mueller told the U.N. Security Council by video from Jordan on Thursday that an estimated 20,000 to 50,000 people remain in Raqqa.

She said the city is encircled and "there is no way for them to get out."

Mueller also said the U.N. has delivered aid only to a few hard-to-reach areas in Syria and not a single besieged location this month. She blamed the Syrian government, armed groups, insecurity and fighting.