This isn't new, though. My children are now in their 30s. I vividly remember another mother moaning that her daughter, then aged about 8 or 9, and her best friend had been moved to opposite sides of the class because they wouldn't stop chatting during lessons despite repeated reminders. The mother had been in to beg the class teacher to let them sit together again because they were so miserable apart. What really took me to town (to channel my 91yo mother) was that the moaning mother was a teacher herself. 
This is a horrible case in Wales. I hope the injuries aren't serious.