These are the hallmarks of either anti-personel smart bombs or drones. The small bombs can penetrate a vehicle and blow up in a small radious. The concusive force and/or shrapnel/blades is what kills.

Perhaps, something like this?

https://taskandpurpose.com/news/hellfire-r9x-drone-strike-al-zawahiri/

They are also used for assassinations since they minimise collateral damage or assets due to their small kill radius in comparison to larger, explosive bombs. If they used drones, then they could likely have a operator guiding them, which is even worse. Since how do you, uh, mis-identify volunteers? Or just hit any vehicles that moved, indiscriminately.