The US Treasury Department imposed sanctions on Wednesday on Karnakis & Karnakis, a law firm based in Greece and Panama, saying it had for years provided legal assistance to Iranian shipping networks.

The US Financial Crimes Enforcement Network also issued an administrative subpoena to advance an investigation into a Greek bank over potential ties to Iran, according to a Treasury statement, which did not name the bank.

FINCEN also issued requests for information to six other European banks that it did not name over relationships with Iranian financial institutions under US sanctions.

“Whether you are conducting illegal oil transfers at sea or sitting in the corner office of a law firm, if you are supporting the Iranian regime, we will find you and sanction you,” Treasury Secretary Scott Bessent said in a release.

Washington has held off striking Iran this month in the war that the US and Israel launched on February 28, and instead has continued the blockade of Iranian ports and issued waves of sanctions on Iranian shipping networks and those who the US says aid them.

State Department spokesman Tommy Pigott said Karnakis & Karnakis for years “set up shell companies to hide the true owners of vessels carrying Iranian oil, petrochemicals, and steel.”

He said the firm created companies that served as fronts for networks selling millions of barrels of Iranian oil to benefit the Islamic Revolutionary Guard Corps Quds Force and the Houthis.

Karnakis & Karnakis did not immediately respond to a request for comment.

Treasury also imposed sanctions on Singapore- and UAE-based shipping agents that it said directly aid Iranian shadow fleet operations.

The US State Department has ordered some diplomats and family members to depart from its missions in Saudi Arabia and plans to withdraw family members from a number of other US missions in the region, US officials told Reuters.

The order came as attacks in Saudi Arabia killed at least one person and injured eight others at a civilian airport in Dammam and two people were killed in a drone attack on an oil field.

State Department spokesperson Tommy Pigott said in a post on X that the department ordered the departure of “non-emergency US government employees and their family members in Saudi Arabia only” amid attacks by the Iran-aligned Houthis in Yemen on civilian targets in the country.

Washington had returned some diplomatic personnel to the region in recent months after many were pulled out when Tehran launched attacks on US facilities after the US-Israeli war on Iran began in late February.

“Iranian-supported Houthis have increasingly engaged in hostilities against Saudi Arabia, including attacks on civilian airports and other critical infrastructure resulting in civilian casualties and severe travel disruptions,” Pigott said.

Four US officials told Reuters that US missions in other Gulf states would also be ordering family members to leave. Pigott did not address changes to other missions outside Saudi Arabia.

The latest withdrawals follow an escalation of the fighting in Yemen, opening another front ​in the regional conflict triggered by the US-Israeli ⁠war on Iran. The wider conflict has snarled global energy trade and hurt Gulf economies.

After the departure order, Saudi Arabia’s civil aviation authority reported an attack on King Fahd International Airport in Dammam that killed one person and injured eight others. Earlier in the day, two people were killed after Saudi air defences intercepted a drone that was attempting to hit a facility at Saudi Aramco’s Shaybah oilfield, the energy ministry said.

The US embassy in Riyadh issued a security alert on Wednesday about possible further attacks by the Houthis on Saudi Arabia, after recent deadly strikes including on Riyadh’s airport.

The embassy and a CIA station hosted there came under attack by drones in early March, as Iran began launching attacks across the region.