The US government has stopped short of officially blaming Iran for launching drones and cruise missiles against Saudi Arabian oil production facilities. But Secretary of State Mike Pompeo and Secretary of Defense Mark Esper have signaled that Iran is at least complicit in the September 14 strike that took out, at least temporarily, about 5% of global oil production capability. Secretary of State Mike Pompeo came close to directly blaming Iran in a post to Twitter on Saturday:

Tehran is behind nearly 100 attacks on Saudi Arabia while Rouhani and Zarif pretend to engage in diplomacy. Amid all the calls for de-escalation, Iran has now launched an unprecedented attack on the world’s energy supply. There is no evidence the attacks came from Yemen. — Secretary Pompeo (@SecPompeo) September 14, 2019

While the mix of weapons involved and where they came from is still in dispute, this would hardly be the first time the Houthi "anti-Saudi resistance militia" used cruise missiles or drones for an attack on Saudi civilian targets. For the last four years, the Houthi forces in Yemen have used a mixture of missiles and drones seized from the Yemeni military and—based on forensic evidence from downed missiles and drones—provided by Iran.

Ballistic missile attacks by the Houthis—using old Soviet "Scud" short-range ballistic missiles and Iranian-built "Scud" clones—have gotten the most media attention in the past. After an attack on Riyadh's airport in 2017, US State and Defense officials accused Iran of violating UN sanctions against export of ballistic-missile technology, displaying pieces of missiles and drones used in attacks.

Buzz bombs

Conflict Armament Research

Houthi militia



Iran TV

George Chernilevsky





But the December 2017 show-and-tell at Joint Base Anacostia-Bolling in Washington DC, also included Iraninan-built drones used by the Houthis. Among the drones were the "Qaseth-1" ("Striker-1"), a rebranded "loitering munition" craft based on Iran's Ababil-2 uncrewed aerial vehicle, a UAV that Iran has produced since the late 1980s. (The same UAV was operated under the name "Mirsad-1" by Hezbollah until 2018.)

The Qaseth-1, according to analysis by Conflict Armament Research, has been used by the Houthis since at least 2017, including in attacks targeting radars for Saudi and UAE Patriot Missile batteries. These "kamikaze drones" fly to pre-programmed GPS locations obtained from open source information before diving on the targeted coordinates.

The propeller-driven UAVs use a Chinese-built two-cylinder gasoline engine, and they have a one-way range of up to 250 kilometers (155 miles). The Qaseth-1 can carry a payload of roughly 30 kilograms (66 pounds)—equivalent to a small-diameter bomb or small air-to-ground missile, which is effective mostly against smaller targets.

The Houthis displayed the Qaseth-1 along with three other types of drones that they claimed in February 2017 to have manufactured themselves. But the parts of the captured Qaseth UAVs, aside from the Chinese engines, were all of Iranian origin.

The Houthis have also used cruise missiles in the past—including a cruise-missile attack against Saudi Arabia's Abha Airport in June that wounded 26 civilians.

One of those missiles appears to be the Soumar, an Iranian copy of a Soviet-era KH-55 air-launched cruise missile adapted for ground launch. Iran obtained a dozen KH-55 cruise missiles from Ukraine in 2001.

In addition to the Soumar, the Houthis unveiled a new cruise missiles this past July, called the Quds-1, and claimed to have new longer-range drones as well. This appears to be the missile used in the June attack on Abha Airport.

Unlike the Qaseth-1, the Iranian KH-55 clones potentially have a range of up to 2,500 kilometers (1,550 miles). From Yemen, that would allow the Houthis to strike targets as far away as Israel and most of Eastern Africa. The Houthis claimed in December 2017 to have targeted a United Arab Emirates nuclear plant with a cruise missile, but the UAE denied that they had been targeted.

Regardless of who launched the attack on the Saudi Aramco oil facilities or what was used, the evidence suggests that the weapons capability that allowed the precision strike came from Iran. And while the war in Yemen has already seen its share of atrocities from both sides—including Saudi-led airstrikes that have killed hundreds of civilians over the past few years—the strike has raised the economic and geopolitical stakes of the conflict much higher.