Has Yemen Really Captured an Iranian Ship Taking Arms to the Houthis?

For some time now, the Yemeni government has been charging that Iran is supporting the Houthi rebels in northern Yemen; Saudi Arabia and Yemen, normally at daggers drawn over many issues, have seemed to have found some common ground in their concern about foreign support for the Houthis, amid reports of Houthi clashes directly with Saudi troops in the border area.

Over the past couple of days, Yemen has announced the seizure of an Iranian ship in Yemeni waters, reputedly carrying arms to the Houthis. Another account here.

I have no idea if this is substantiated — Iran is denying it — but if the Yemenis have actual evidence this could have some interesting repercussions. I've already noted the tendency of some in the Sunni Arab world to portray the Yemeni conflict as a Sunni-Shi‘i one, even though Zaydis have little in common with Iran's "twelver" Shi‘ites other than both being nominally Shi‘ite, and the fact that Yemeni President Salih, who's leading the fight against the Houthis, is himself a Zaydi. But if Iran really is supporting the Houthis — up to now I've been skeptical of those charges — this could actually push the Saudis and the Yemeni government into some kind of cooperation. The purported border clashes suggest that the hammer of the Yemeni government offensive is pushing the Houthis up against the anvil of the Saudi border. Proof of Iranian involvement could drive the two traditionally rival governments much closer together. This really bears watching.