Secretary of State Mike Pompeo told Saudi Crown Prince Mohammed bin Salman on Sunday the US will hold accountable all those involved in the killing of a dissident Saudi journalist, in a telephone call that also took in the conflict in Yemen.

The surprise U.S. call for a ceasefire in Yemen marks a growing sense that Saudi Arabia's campaign has proven disastrous, but experts say more action is needed to end the devastating war.

On Tuesday, U.S. Defense Secretary Jim Mattis urged a halt in the three-year Saudi-led assault to defeat Huthi rebels in Yemen, the impoverished country mired in what the U.N. has called the world's worst humanitarian catastrophe.

Turkey cast doubt Wednesday on whether Saudi Arabia was willing to "genuinely cooperate" in the investigation into the murder of journalist Jamal Khashoggi, as international pressure increased on Riyadh to provide answers.

A Saudi oil tanker carrying the first batch of petroleum products worth $60 million arrived at Yemen's Aden port Monday, to help power electricity stations and prop up the war-torn country's sagging economy, officials said.

Turkey on Monday called on Saudi Arabia to reveal the "whole truth" about the murder of Jamal Khashoggi, as the whereabouts of the journalist's body dominated a visit to the country by Riyadh's top prosecutor.

Saudi Arabia will prosecute the suspects in the killing of journalist Jamal Khashoggi, Riyadh's foreign minister said Saturday in response to a call by Turkey for their extradition.

Saudi Arabia acknowledged on Thursday that the murder of journalist Jamal Khashoggi appeared to have been premeditated, based on information from Turkey, as it sought to draw a line under the crisis.

Global diplomatic fallout from the murder of journalist Jamal Khashoggi in Saudi Arabia's Istanbul consulate may help Qatar in its political stand-off with the kingdom, experts said.

The killing of a critic like Jamal Khashoggi is something that must "never happen again", Saudi Arabia's Foreign Minister Adel al-Jubeir said Tuesday, as he pledged a full investigation into the journalist's death.

Canada condemned Saudi Arabia's account of the death of dissident journalist Jamal Khashoggi as inconsistent and not credible on Saturday, calling for a "thorough" investigation.