The Shoreditch Crossbow Attacks

What do you reckon?  Good old fashioned nutter with a grievance against world attacking people at random or something more sinister and targeted?

I was sat in the garden in my old house years ago and something just missed my head and hit the washing line.  A bloody cross bow.  I called the police and they told me not to touch it etc and they came around quite quickly.  The PO then just handled the bow stuck it in a bag and I think that was the end of that.  It could have hit me or worse, my toddler son at the time or one of the animals.  V hard to prove where it came from.