Crown prince says strike on the heart of the kingdom's oil industry was a 'real test' of global will, urges international community to take a 'firm stance'

Strike was to convince US-allied kingdom to end its war on Houthi rebels, says Iranian president, in implicit denial of Washington's allegation his country launched assault

Kingdom is 5th country to be part of mission to secure vessels in Strait of Hormuz following series of attacks blamed on Iran

US president facing competing urges of keeping up pressure on Tehran to negotiate while deterring any further Iranian attacks and avoiding another Middle East war

Secretary of State to meet with leaders in Riyadh as some in US push for military action against Iran following assault on massive energy facility

Attack blamed on Iran that halved kingdom's oil production is latest in a series of unclaimed acts of sabotage in the Gulf, which experts say could be a new tactic by Tehran

Prince Abdulaziz bin Salman makes light of situation at international energy forum amid growing concerns about health of global oil market

Wall Street Journal says Washington provided Riyadh with assessment of airborne weapons used in assault but Saudis say not enough evidence it was launched by Iranians

US president has the world on tenterhooks over his response to a weekend attack on Saudi oil facilities that his top diplomat has blamed on the Iranians

As tensions rise between Tehran and Washington, Trump says his forces are 'locked and loaded'