UN aid official urges Syria govt to 'live up to promises'

This image made from video published online by Amaq News Agency of the Islamic State group shows a cement factory where in a brazen assault near the Syrian capital, Islamic State militants snatched up to 300 cement workers and contractors from their workplace northeast of Damascus Thursday, April 7, 2016. (militant video via AP) (The Associated Press)

Jan Egeland, left, Senior Advisor to the United Nations Special Envoy for Syria, Staffan de Mistura, right, UN Special Envoy for Syria, inform about the International Syria Support Group's Humanitarian Access Task Force update at the European headquarters of the United Nations in Geneva, Switzerland, Thursday, April 7, 2016. (Martial Trezzini/Keystone via AP) (The Associated Press)

Staffan de Mistura, UN Special Envoy for Syria, speaks about the International Syria Support Group's Humanitarian Access Task Force update at the European headquarters of the United Nations in Geneva, Switzerland, Thursday, April 7, 2016. (Martial Trezzini/Keystone via AP) (The Associated Press)

A leader of U.N.-backed humanitarian efforts for Syria says he's "disappointed" with recent efforts to get aid convoys into hard-to-reach and besieged areas, and is calling on the government to "live up to its promises."

Jan Egeland, the humanitarian aid adviser for the U.N.'s Syria envoy, told reporters Thursday in Geneva that "April was supposed to be our best month" but that aid delivery is "not getting better and better, it's actually slowing down."

Egeland spoke during a break in U.N.-sponsored indirect talks between the Syrian government and the opposition delegation, which are to resume next week

Humanitarian assistance to Syria's people is part of an international response to the country's crisis that also includes a U.S.- and Russia-monitored cease-fire that has largely held over the last month.