The coalition closed all air,land and sea ports to stem the flow of arms from Iran on November 6,after Saudi Arabia intercepted a missile fired towards its capital Riyadh. It has since said that aid can go through"liberated ports"but not the key Houthi-controlled port of Hodeidah.
Now United Nations sanctions monitors have told the Security Council in a confidential report the coalition is threatening the peace,security and stability of the country by blocking humanitarian aid.
The UN has appealed for the blockade to be lifted,saying it could spark the largest famine the world has seen in decades. Some seven million people are on the brink of famine and nearly 900,000 have been infected with cholera.
"Saudi Arabia-led coalition restrictions to the delivery of humanitarian assistance fall under resolution 2216 (2015) as an obstruction to the delivery of humanitarian assistance,"the UN monitors wrote in the executive summary of their report.
The independent monitors also called on the coalition to provide evidence backing Riyadh's claim that Iran was supplying missiles to the Houthi rebels,warning that a failure to do so would violate a February 2017 council resolution.
That resolution,adopted by the UN Security Council in April 2015 shortly after the Saudi-led coalition intervened in Yemen,states that obstructing aid access and delivery is an act that threatens the peace,security and stability of the country.