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They are reporting that the devices were made from pressure cookers with metal and ball breeaing for debri.
That should help in narrowing their search.
Add to that any video footage from the stores on that street and they should hopefully be able to find who the culprits are.
I would imagine that they could be able to figure out what brand/model of cooker was used, and look for possible purchase points and go from there.
forensic science is definitely a big help in these matters.
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