BUTT…
not everyone's device exploded, only specific targets
meaning these particular devices could have other contents, not regular li-ion batteries. and them are old moto devices so likely ni-cad battery, not modern. so could be c4 or similar. not simly li-ion fires.
li-ion battery fires get warm, hot, hotter, hotter expand the containment and finally explode. these appear to be concusion wave explosions.. something else