| http://www.w3.org/ns/prov#value | - It could be any one of a domestic group, a foreign jihadist group, or alternatively it could be like what happened in Norway a few years ago where it is just an individual.From what I have seen, the devices have black powder in them which is commonly used when there are ball bearings put in a device or some form of nails or other things to create shrapnel that causes harm.They are not uncommon.
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