"Houthi rebels have been using drones in combat since the start of the Saudi-led war. The first appeared to be off-the-shelf, hobby-kit-style drones, but later

"Houthi rebels have been using drones in combat since the start of the Saudi-led war. The first appeared to be off-the-shelf, hobby-kit-style drones, but later versions have been nearly identical to Iranian models. Tehran denies supplying the rebels with weapons, but the west and Gulf Arab nations say it does." https://www.theguardian.com/world/2019/sep/14/major-saudi-arabia-oil-facilities-hit-by-drone-strikes https://www.theguardian.com/world/2019/sep/14/major-saudi-ar... Also if the drones were launched from Yemen then they've probably flown ≥700km, so I'd be surprised if they're commercial octocopters.