These weapons and explosives recently captured from Houthi forces in Midi, Yemen. The directional mines look well made although they do exhibit features similar to IEDs such as det cord initiation. Possibly Iranian manufacture as these are very similar to Iranian directional mines previously captured and documented in Syria.

The below image is an Iranian directional mine that was captured in Syria and documented by ARES (Armament Research Services) See this report HERE

Sources: https://twitter.com/LostWeapons/status/984429720258265088

ARES Report on Iranian directional mines:

http://armamentresearch.com/iranian-directional-anti-personnel-mines-in-syria/