Not passing the smell test. Maybe they were sitting next to depleted uranium shells and the radioactive decay set them off.
...or perhaps small anti-personnel mines sown by the Hezzies for the IDF?
Big time...
LOL. Anyone out in walnut size hail has bigger problems than the off chance that a submunition will go off.
In the US, despite the enormous amount of unexploded ordnance buried or lying on the ground on and around closed military bases, we have had about 7 serious injuries since the late 1940's. They are hard to set off because they didn't go off when they were dropped. Something was wrong with the fuzing. Every one of those incidents has been due to extreme stupidity on the part of the injured person (eg banging two unexploded 75mm's together on the front porch).
This despite that inactive military bases have a lot of traffic in hunters and hikers.
I've been to sites in the US where you can walk around and see submunitions every ten feet. There are herds of mustangs running around those sites. They aren't finding blown up horses every day, or at all.