'All parties must live up to their obligations under international humanitarian law,' Mark Lowcock said echoing the statement of the Special Envoy, Martin Griffiths.
'I ask that the parties implement a cessation of hostilities, not least in and around all the infrastructure and facilities on which the aid operation and commercial importers rely,' the statement reads.
Earlier the UN Secretary General António Guterres warned against the destruction of Al Hudaydah Port saying it will result in disaster.
Despite international warnings and serious humanitarian conditions, the Saudi coalition started extensive attacks on June 13 to take control of Al Hudaydah.
Saudi Arabia and a number of its regional allies launched a devastating military campaign against Yemen in March 2015, with the aim of bringing the government of Mansour Hadi back to power and crushing the country’s Houthi Ansarullah movement.
Some 16,000 Yemenis have been killed and thousands more injured since the onset of the Saudi-led aggression.
The assaults of the Saudi-led coalition forces have failed to stop the Yemenis from resisting the aggression. Recently, the Yemeni army unveiled its home-made underground missile launching pads.