Following attacks on Saudi Arabia’s oil infrastructure September 14, President Donald Trump ordered Treasury Secretary Steven Mnuchin to "substantially increase sanctions" on Iran.
He did not give any additional details, but it can be one of the responses the U.S. is expected to give since it has blamed Iran for the attacks.
Meanwhile, Saudi Arabia promised to provide evidence on Wednesday linking Iran with the unprecedented attack that reduced Saudi oil output by 50 percent. the Saudi Defense Ministry said it would present "material evidence and Iranian weapons proving the Iranian regime's involvement in the terrorist attack" at a news conference on Wednesday at 1430 GMT, or 10:30 Washington time.
U.S. Secretary of State in Saudi Arabia was to meet Prince Mohammed bin Salman on Wednesday to discuss the crisis before travelling to the United Arab Emirates.
U.S. officials have said cruise missiles and drones were used in the attack originating from southern Iran but no evidence has been made public yet.
Russian President Vladimir Putin, who has offered to sell Riyadh defense systems, called for a "thorough and impartial" probe during a phone call with Prince Mohammed.
The assault exposed serious gaps in Saudi air defenses despite billions of dollars spent on Western military hardware and repeated attacks on vital assets during its four-and-a-half year foray into the Yemen war.