On Tuesday, Yemeni forces announced that they attacked a "Saudi-led coalition warship" off the coast of Hudaydah in response to an air strike on Monday which claimed the lives of over 16 civilians, including women and children.
Turki Al-Malki, spokesman of the coalition, said in a statement carried by the Saudi Press Agency that the tanker came under attack at around 1.30 p.m. on the worldwide waters, west of the port of Hodeidah, which is under the control of armed Houthi militias.
The tanker suffered a slight hit, but continued on its route, according to Alarabiya.
At the end of a year ago, the Houthis threatened that they would start attacking oil tankers and warships sailing under enemy flag if the Gulf coalition fighting it in the country does not reopen its ports.
Last week, a missile attack killed an Egyptian worker and wounded two others in the Saudi capital, Riyadh.
The security sources said there was no camp for the displaced in the area.
The attack is further evidence of Iran's backing of the Houthis, said Colonel Turki Al Malki, spokesman for the Coalition Forces. Tehran and the Houthis deny the charge.
Griffiths has already held talks with Houthi authorities as well as internationally-recognised Yemeni President Abd-Rabbu Mansour Hadi and Saudi officials in Riyadh.
Over 10,000 civilians have died since 2011, and more than 22 million people - 80 per cent of the population - need humanitarian assistance.
U.N. Secretary-General Antonio Guterres, right, stand up next to Swedish Minister for International Development Cooperation and the climate and Deputy Prime Minister Isabella Loevin, left, as he speaks to the media during a press stakeout after the High-Level Pledging Event for the Humanitarian Crisis in Yemen, at the European headquarters of the United Nations in Geneva, Switzerland, Tuesday, April 3, 2018.
The one-day conference co-hosted by Sweden, Switzerland and the United Nations collected pledges totaling $2.01 billion from 40 countries and organizations.
"But we also ask Saudi Arabia, the United Arab Emirates, Iran - who are supporting opposing sides - and for that matter, the United Kingdom, the United States, who are earning enormous sums of money on arms sales to this conflict to push the parties to the table". "Sana'a airport is also a lifeline that must be kept open".