These are the individual sub-munitions from the BL-755 aircraft bomb.
From the series of poictures, it appears that there was a single weapon that malfunctioned, landing on the ground with dispersing all (or possibly any) of its cargo of 147 bomblets. Around 11-15 bomblets remained in the crushed remains of the bomb; a further 68-72 are laid out in the tiled room. Thus the total recovered is roughly between 79 and 87. This is more than half the original number packed in the bomb.The cluster bomb was most likely dropped by Saudi Arabia-led coalition forces. Out of the coalition members, UAE and Saudi Arabia are known to possess this type of cluster bombs in their stockpiles. Picture taken at YEMAC (local demining organisation) storage center in Hayran, Hajjah.