The United Nations World Food Program (WFP) warned on Tuesday that the recent five-day "humanitarian pause" in Yemen was not enough to reach all those in need of food and other relief supplies.

In a statement, it appealed for a new truce in the conflict to deliver desperately needed aid.

The WFP dispatched food for more than 400,000 people in the 72-hour pause, and managed to reach areas that were previously inaccessible, but this was only half the 738,000 people it hoped to reach.

According to the UN, Yemen imports almost 90 percent of its food from abroad. WFP is extremely concerned that the impact of traders being unable to import food and transport it around the country will affect people's ability to feed their families.