A senior U.N. humanitarian official is lamenting the world body's failure to achieve its target goals in war-ravaged Syria.

Jan Egeland, an adviser to U.N.'s special envoy to Syria, says only 40 percent of planned humanitarian relief was delivered in June and July. He said the U.N. had hoped to reach 1.2 million people over the last two months, but fell well short of that target.

Egeland says there is "fighting in too many places, and that affects the besieged towns more than anything else."

Speaking on Thursday in Geneva, Egeland also said the U.N. is prepared to send aid to the contested city of Aleppo as soon as fighting pauses. The last delivery to the opposition-held half of the city, home to an estimated 300,000 people, was in June.