Ok this is worrying and send to have been a few of these but first explosive device I have read about in the UK.
Also of note is this kind of device being taken up by the people who have felt pushed out, treated like third class citizens and spent a number of decades in fear of these devices from two factions and in a possible intended turn of events have more decided to use the same tools they feared for so long.
Seems almost like they are sending a message?!
Hopefully it is just one message to get the point across and there will be no more of this?!