Saudi Arabia has claimed to have intercepted all seven missiles fired from Yemen, but missile experts who watched interception videos have questioned those claims.

Jeffrey Lewis, a missile expert at the Middlebury Institute of International Studies in Monterey, California, has previously studied other Saudi Patriot missile launches.

Other analysts have also questioned the US Patriot defence system's suitability for intercepting missiles such as those fired by Houthis in Yemen.

Haven't analyzed all the videos yet, but it looks like one interceptor failed catastrophically (left) and another pulled a u-turn and exploded in Riyadh (right). Not a good day for Saudi missile defenses. pic.twitter.com/4xtgTQwGSM — Jeffrey Lewis (@ArmsControlWonk) March 26, 2018

Video analysis

One video appears to show a Patriot missile launch on Sunday night going rapidly wrong, with the missile changing course midair, crashing into a neighbourhood in Riyadh and exploding.

Another appears to detonate shortly after being launched in the Saudi capital.

"It's more likely that none of the missiles have been intercepted than it is that the Saudis have shot down any," said Lewis.

Another video from #SaudiArabia potentially shows interceptor missing incoming missile. pic.twitter.com/o2ElpPKiXM — Strategic Sentinel (@StratSentinel) March 25, 2018

New angle suggests this is actually a spectacular failure of a #Saudi interceptor and not the missile fired at #Riyadh pic.twitter.com/TejVbA8fh3 — Strategic Sentinel (@StratSentinel) March 25, 2018

Official claim

Sunday night: Saudi Colonel Turki al-Maliki only said in a statement that "all seven ballistic missiles were intercepted and destroyed".

The Saudi military said three of the missiles were aimed at Riyadh, two were aimed at Jazan and one each was aimed at Najran and Khamis Mushait.

The Saudi-owned satellite news channel Al Arabiya aired footage that it said showed Patriot missile batteries shooting at the incoming Houthi missiles in Riyadh.

One Patriot missile appears to explode seconds after being launched, drawing a shout from a bystander as flaming fragments rain down on the ground.

Casualties: Sunday night's launch saw one Egyptian killed and two others wounded in Riyadh by a missile fragment, marking the first casualties in the Saudi capital since the war began.

Previous rockets fired by the Yemeni rebels have caused deaths in other parts of the kingdom.

Saudi Arabia says it has been targeted by some 90 ballistic missiles launched by Houthi rebels and their allies since launching a war against them three years ago.

What used to be a rocket laying in a #Riyadh street. Unclear if this is a #Saudi interceptor or a missile fired by enemy forces. pic.twitter.com/qVA92hsb2P — Strategic Sentinel (@StratSentinel) March 25, 2018

Houthi missiles

Separating warheads: The Houthi Burkan, or Volcano, missiles used in attacks on Riyadh have warheads that separate from the missile fuselage, making them even harder to hit.

"The Patriot systems are really overmatched - the missiles that the Houthis are launching at Riyadh have a range of 1,000 kilometres and a separating warhead," he said.

"I wouldn't expect any of the intercepts to succeed against a missile like that."

Iran: The UN, Western countries and the Saudi-led military coalition fighting in Yemen all say the Burkan mirrors characteristics of an Iranian Qiam ballistic missile.

They say that suggests Iran either shared the technology or smuggled disassembled missiles to the Houthis who then rebuilt them.

Iran has long denied supplying arms to the Houthis, though a growing body of evidence contradicts its claim.

Patriot shortcoming