New developments and accusations following the attack on Saudi Arabia’s oil installations.

The Saudis said the weapons involved were Iranian.

United States President Trump sent his top diplomat to the region and said tougher sanctions against Iran are coming.

Tehran denies involvement and warns any military action would be met with force.

CGTN’s Toby Muse has more.

Saudi Arabia showed off what it said is the debris from the attack, including what it called an Iranian delta-wing drone and ‘Ya Ali’ cruise missiles.

“This attack did not originate from Yemen despite Iran’s best efforts to make it appear so. Their collaboration with their proxy in the region to create this false narrative is clear. Secondly, the attack was launched from the north and was unquestionably sponsored by Iran,” said Turki Al-Maliki the Saudi Military spokesman.

U.S. Secretary of State Mike Pompeo flew to Saudi Arabia. He was even more direct, calling the attacks “an act of war” by Iran.

President Donald Trump said the US would increase sanctions on Iran, promising details in the next 48 hours. And, taking questions from reporters, he left open the option of military action as some of his supporters are demanding.

“Well there are many options as you know Phil there are many options. And there’s the ultimate option and there are options a lot less than that. And we’ll see. We’re in a very powerful position,” said Donald Trump the U.S. President.

Yemeni Houthi rebels insist they carried out the weekend attacks that cut Saudi Arabia’s oil production by 50 percent. They called it retaliation for the Saudi-led war in Yemen that’s killed tens of thousands and pushed the country to the point of famine. Iran denies the attack, and says the blame rests with the Saudi coalition.

The backdrop to this crisis is Iran, increasing its enrichment of uranium following the US decision to unilaterally withdraw from the international nuclear deal last year. Even last week, there were expectations that the leaders of the two countries could meet. That seems a distant prospect now.